diff --git a/src/audio.cc b/src/audio.cc
index ee71201..77000c6 100644
--- a/src/audio.cc
+++ b/src/audio.cc
@@ -58,7 +58,7 @@ static int audioSoundDecoderReadHandler(void* data, void* buffer, unsigned int s
 
 // AudioOpen
 // 0x41A2EC
-int audioOpen(const char* fname, int flags)
+int audioOpen(const char* fname, int* channels, int* sampleRate)
 {
     char path[80];
     snprintf(path, sizeof(path), "%s", fname);
@@ -70,28 +70,7 @@ int audioOpen(const char* fname, int flags)
         compression = 0;
     }
 
-    char mode[4];
-    memset(mode, 0, 4);
-
-    // NOTE: Original implementation is slightly different, it uses separate
-    // variable to track index where to set 't' and 'b'.
-    char* pm = mode;
-    if (flags & 1) {
-        *pm++ = 'w';
-    } else if (flags & 2) {
-        *pm++ = 'w';
-        *pm++ = '+';
-    } else {
-        *pm++ = 'r';
-    }
-
-    if (flags & 0x100) {
-        *pm++ = 't';
-    } else if (flags & 0x200) {
-        *pm++ = 'b';
-    }
-
-    File* stream = fileOpen(path, mode);
+    File* stream = fileOpen(path, "rb");
     if (stream == NULL) {
         debugPrint("AudioOpen: Couldn't open %s for read\n", path);
         return -1;
@@ -121,6 +100,9 @@ int audioOpen(const char* fname, int flags)
         audioFile->flags |= AUDIO_COMPRESSED;
         audioFile->soundDecoder = soundDecoderInit(audioSoundDecoderReadHandler, audioFile->stream, &(audioFile->channels), &(audioFile->sampleRate), &(audioFile->fileSize));
         audioFile->fileSize *= 2;
+
+        *channels = audioFile->channels;
+        *sampleRate = audioFile->sampleRate;
     } else {
         audioFile->fileSize = fileGetSize(stream);
     }
diff --git a/src/audio.h b/src/audio.h
index 2b96ac9..752b914 100644
--- a/src/audio.h
+++ b/src/audio.h
@@ -5,7 +5,7 @@ namespace fallout {
 
 typedef bool(AudioQueryCompressedFunc)(char* filePath);
 
-int audioOpen(const char* fname, int mode);
+int audioOpen(const char* fname, int* channels, int* sampleRate);
 int audioClose(int handle);
 int audioRead(int handle, void* buffer, unsigned int size);
 long audioSeek(int handle, long offset, int origin);
diff --git a/src/audio_file.cc b/src/audio_file.cc
index d1dce84..8333c5a 100644
--- a/src/audio_file.cc
+++ b/src/audio_file.cc
@@ -57,7 +57,7 @@ static int audioFileSoundDecoderReadHandler(void* data, void* buffer, unsigned i
 }
 
 // 0x41A88C
-int audioFileOpen(const char* fname, int flags)
+int audioFileOpen(const char* fname, int* channels, int* sampleRate)
 {
     char path[COMPAT_MAX_PATH];
     strcpy(path, fname);
@@ -69,28 +69,7 @@ int audioFileOpen(const char* fname, int flags)
         compression = 0;
     }
 
-    char mode[4];
-    memset(mode, '\0', 4);
-
-    // NOTE: Original implementation is slightly different, it uses separate
-    // variable to track index where to set 't' and 'b'.
-    char* pm = mode;
-    if (flags & 0x01) {
-        *pm++ = 'w';
-    } else if (flags & 0x02) {
-        *pm++ = 'w';
-        *pm++ = '+';
-    } else {
-        *pm++ = 'r';
-    }
-
-    if (flags & 0x0100) {
-        *pm++ = 't';
-    } else if (flags & 0x0200) {
-        *pm++ = 'b';
-    }
-
-    FILE* stream = compat_fopen(path, mode);
+    FILE* stream = compat_fopen(path, "rb");
     if (stream == NULL) {
         return -1;
     }
@@ -119,6 +98,9 @@ int audioFileOpen(const char* fname, int flags)
         audioFile->flags |= AUDIO_FILE_COMPRESSED;
         audioFile->soundDecoder = soundDecoderInit(audioFileSoundDecoderReadHandler, audioFile->stream, &(audioFile->channels), &(audioFile->sampleRate), &(audioFile->fileSize));
         audioFile->fileSize *= 2;
+
+        *channels = audioFile->channels;
+        *sampleRate = audioFile->sampleRate;
     } else {
         audioFile->fileSize = getFileSize(stream);
     }
diff --git a/src/audio_file.h b/src/audio_file.h
index f00734b..a43bdc7 100644
--- a/src/audio_file.h
+++ b/src/audio_file.h
@@ -5,7 +5,7 @@ namespace fallout {
 
 typedef bool(AudioFileQueryCompressedFunc)(char* filePath);
 
-int audioFileOpen(const char* fname, int flags);
+int audioFileOpen(const char* fname, int* channels, int* sampleRate);
 int audioFileClose(int handle);
 int audioFileRead(int handle, void* buf, unsigned int size);
 long audioFileSeek(int handle, long offset, int origin);
diff --git a/src/combat.cc b/src/combat.cc
index f7aafaf..cde7b7d 100644
--- a/src/combat.cc
+++ b/src/combat.cc
@@ -168,7 +168,7 @@ static bool _combat_call_display = false;
 // Accuracy modifiers for hit locations.
 //
 // 0x510954
-static const int _hit_location_penalty[HIT_LOCATION_COUNT] = {
+static int hit_location_penalty_default[HIT_LOCATION_COUNT] = {
     -40,
     -30,
     -30,
@@ -180,6 +180,8 @@ static const int _hit_location_penalty[HIT_LOCATION_COUNT] = {
     0,
 };
 
+static int hit_location_penalty[HIT_LOCATION_COUNT];
+
 // Critical hit tables for every kill type.
 //
 // 0x510978
@@ -2029,6 +2031,7 @@ int combatInit()
     burstModInit();
     unarmedInit();
     damageModInit();
+    combat_reset_hit_location_penalty();
 
     return 0;
 }
@@ -2058,6 +2061,7 @@ void combatReset()
 
     // SFALL
     criticalsReset();
+    combat_reset_hit_location_penalty();
 }
 
 // 0x420E14
@@ -3831,7 +3835,7 @@ static int attackCompute(Attack* attack)
         roll = _compute_spray(attack, accuracy, &ammoQuantity, &v26, anim);
     } else {
         int chance = critterGetStat(attack->attacker, STAT_CRITICAL_CHANCE);
-        roll = randomRoll(accuracy, chance - _hit_location_penalty[attack->defenderHitLocation], NULL);
+        roll = randomRoll(accuracy, chance - hit_location_penalty[attack->defenderHitLocation], NULL);
     }
 
     if (roll == ROLL_FAILURE) {
@@ -4417,9 +4421,9 @@ static int attackDetermineToHit(Object* attacker, int tile, Object* defender, in
     }
 
     if (isRangedWeapon) {
-        accuracy += _hit_location_penalty[hitLocation];
+        accuracy += hit_location_penalty[hitLocation];
     } else {
-        accuracy += _hit_location_penalty[hitLocation] / 2;
+        accuracy += hit_location_penalty[hitLocation] / 2;
     }
 
     if (defender != NULL && (defender->flags & OBJECT_MULTIHEX) != 0) {
@@ -6798,4 +6802,27 @@ static void damageModCalculateYaam(DamageCalculationContext* context)
     }
 }
 
+int combat_get_hit_location_penalty(int hit_location)
+{
+    if (hit_location >= 0 && hit_location < HIT_LOCATION_COUNT) {
+        return hit_location_penalty[hit_location];
+    } else {
+        return 0;
+    }
+}
+
+void combat_set_hit_location_penalty(int hit_location, int penalty)
+{
+    if (hit_location >= 0 && hit_location < HIT_LOCATION_COUNT) {
+        hit_location_penalty[hit_location] = penalty;
+    }
+}
+
+void combat_reset_hit_location_penalty()
+{
+    for (int hit_location = 0; hit_location < HIT_LOCATION_COUNT; hit_location++) {
+        hit_location_penalty[hit_location] = hit_location_penalty_default[hit_location];
+    }
+}
+
 } // namespace fallout
diff --git a/src/combat.h b/src/combat.h
index 5775eae..4dc0430 100644
--- a/src/combat.h
+++ b/src/combat.h
@@ -71,6 +71,9 @@ int unarmedGetKickHitMode(bool isSecondary);
 bool unarmedIsPenetrating(int hitMode);
 bool damageModGetBonusHthDamageFix();
 bool damageModGetDisplayBonusDamage();
+int combat_get_hit_location_penalty(int hit_location);
+void combat_set_hit_location_penalty(int hit_location, int penalty);
+void combat_reset_hit_location_penalty();
 
 static inline bool isInCombat()
 {
diff --git a/src/config.cc b/src/config.cc
index 9143e55..966b0d4 100644
--- a/src/config.cc
+++ b/src/config.cc
@@ -289,7 +289,7 @@ bool configRead(Config* config, const char* filePath, bool isDb)
     } else {
         FILE* stream = compat_fopen(filePath, "rt");
         if (stream != NULL) {
-            while (fgets(string, sizeof(string), stream) != NULL) {
+            while (compat_fgets(string, sizeof(string), stream) != NULL) {
                 configParseLine(config, string);
             }
 
diff --git a/src/dictionary.cc b/src/dictionary.cc
index af873e9..31acacb 100644
--- a/src/dictionary.cc
+++ b/src/dictionary.cc
@@ -447,7 +447,7 @@ int dictionaryLoad(FILE* stream, Dictionary* dictionary, int a3)
             return -1;
         }
 
-        if (fgets(entry->key, keyLength + 1, stream) == NULL) {
+        if (compat_fgets(entry->key, keyLength + 1, stream) == NULL) {
             return -1;
         }
 
diff --git a/src/game_sound.cc b/src/game_sound.cc
index e7a838c..b1033ed 100644
--- a/src/game_sound.cc
+++ b/src/game_sound.cc
@@ -157,7 +157,7 @@ static int _gsound_speech_volume_get_set(int volume);
 static void speechPause();
 static void speechResume();
 static void _gsound_bkg_proc();
-static int gameSoundFileOpen(const char* fname, int access);
+static int gameSoundFileOpen(const char* fname, int* channels, int* sampleRate);
 static long _gsound_write_();
 static long gameSoundFileTellNotImplemented(int handle);
 static int gameSoundFileWrite(int handle, const void* buf, unsigned int size);
@@ -1548,12 +1548,8 @@ void _gsound_bkg_proc()
 }
 
 // 0x451A08
-int gameSoundFileOpen(const char* fname, int flags)
+int gameSoundFileOpen(const char* fname, int* channels, int* sampleRate)
 {
-    if ((flags & 2) != 0) {
-        return -1;
-    }
-
     File* stream = fileOpen(fname, "rb");
     if (stream == NULL) {
         return -1;
diff --git a/src/interface.cc b/src/interface.cc
index 3204faa..1415892 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -2616,4 +2616,37 @@ static void sidePanelsDraw(const char* path, int win, bool isLeading)
     internal_free(image);
 }
 
+// NOTE: Follows Sfall implementation of `GetCurrentAttackMode`. It slightly
+// differs from `interfaceGetCurrentHitMode` (can return one of `reload` hit
+// modes, the default is `punch`).
+//
+// 0x45EF6C
+bool interface_get_current_attack_mode(int* hit_mode)
+{
+    if (gInterfaceBarWindow == -1) {
+        return false;
+    }
+
+    switch (gInterfaceItemStates[gInterfaceCurrentHand].action) {
+    case INTERFACE_ITEM_ACTION_PRIMARY_AIMING:
+    case INTERFACE_ITEM_ACTION_PRIMARY:
+        *hit_mode = gInterfaceItemStates[gInterfaceCurrentHand].primaryHitMode;
+        break;
+    case INTERFACE_ITEM_ACTION_SECONDARY_AIMING:
+    case INTERFACE_ITEM_ACTION_SECONDARY:
+        *hit_mode = gInterfaceItemStates[gInterfaceCurrentHand].secondaryHitMode;
+        break;
+    case INTERFACE_ITEM_ACTION_RELOAD:
+        *hit_mode = gInterfaceCurrentHand == HAND_LEFT
+            ? HIT_MODE_LEFT_WEAPON_RELOAD
+            : HIT_MODE_RIGHT_WEAPON_RELOAD;
+        break;
+    default:
+        *hit_mode = HIT_MODE_PUNCH;
+        break;
+    }
+
+    return true;
+}
+
 } // namespace fallout
diff --git a/src/interface.h b/src/interface.h
index 07772df..acec2df 100644
--- a/src/interface.h
+++ b/src/interface.h
@@ -69,6 +69,7 @@ void interfaceBarEndButtonsRenderRedLights();
 int indicatorBarRefresh();
 bool indicatorBarShow();
 bool indicatorBarHide();
+bool interface_get_current_attack_mode(int* hit_mode);
 
 unsigned char* customInterfaceBarGetBackgroundImageData();
 
diff --git a/src/interpreter.cc b/src/interpreter.cc
index 8729fd5..23793ac 100644
--- a/src/interpreter.cc
+++ b/src/interpreter.cc
@@ -3268,4 +3268,29 @@ bool ProgramValue::isEmpty()
     return true;
 }
 
+// Matches Sfall implementation.
+bool ProgramValue::isInt()
+{
+    return opcode == VALUE_TYPE_INT;
+}
+
+// Matches Sfall implementation.
+bool ProgramValue::isFloat()
+{
+    return opcode == VALUE_TYPE_FLOAT;
+}
+
+// Matches Sfall implementation.
+float ProgramValue::asFloat()
+{
+    switch (opcode) {
+    case VALUE_TYPE_INT:
+        return static_cast<float>(integerValue);
+    case VALUE_TYPE_FLOAT:
+        return floatValue;
+    default:
+        return 0.0;
+    }
+}
+
 } // namespace fallout
diff --git a/src/interpreter.h b/src/interpreter.h
index 91d27bb..f84347f 100644
--- a/src/interpreter.h
+++ b/src/interpreter.h
@@ -149,6 +149,9 @@ typedef struct ProgramValue {
     };
 
     bool isEmpty();
+    bool isInt();
+    bool isFloat();
+    float asFloat();
 } ProgramValue;
 
 typedef std::vector<ProgramValue> ProgramStack;
diff --git a/src/interpreter_extra.cc b/src/interpreter_extra.cc
index 1cce7b4..12f3222 100644
--- a/src/interpreter_extra.cc
+++ b/src/interpreter_extra.cc
@@ -2987,7 +2987,7 @@ static void opGetMessageString(Program* program)
     int messageListIndex = programStackPopInteger(program);
 
     char* string;
-    if (messageIndex >= 1) {
+    if (messageIndex >= 0) {
         string = _scr_get_msg_str_speech(messageListIndex, messageIndex, 1);
         if (string == NULL) {
             debugPrint("\nError: No message file EXISTS!: index %d, line %d", messageListIndex, messageIndex);
diff --git a/src/mouse.cc b/src/mouse.cc
index 09e4334..6e8a8bb 100644
--- a/src/mouse.cc
+++ b/src/mouse.cc
@@ -54,7 +54,7 @@ static unsigned char* _mouse_fptr = NULL;
 static double gMouseSensitivity = 1.0;
 
 // 0x51E2AC
-static int gMouseButtonsState = 0;
+static int last_buttons = 0;
 
 // 0x6AC790
 static bool gCursorIsHidden;
@@ -415,7 +415,7 @@ void _mouse_info()
         }
         x = 0;
         y = 0;
-        buttons = gMouseButtonsState;
+        buttons = last_buttons;
     }
 
     _mouse_simulate_input(x, y, buttons);
@@ -447,7 +447,7 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
         return;
     }
 
-    if (delta_x || delta_y || buttons != gMouseButtonsState) {
+    if (delta_x || delta_y || buttons != last_buttons) {
         if (gVcrState == 0) {
             if (_vcr_buffer_index == VCR_BUFFER_CAPACITY - 1) {
                 vcrDump();
@@ -464,13 +464,13 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
             _vcr_buffer_index++;
         }
     } else {
-        if (gMouseButtonsState == 0) {
+        if (last_buttons == 0) {
             if (!_mouse_idling) {
                 _mouse_idle_start_time = getTicks();
                 _mouse_idling = 1;
             }
 
-            gMouseButtonsState = 0;
+            last_buttons = 0;
             _raw_buttons = 0;
             gMouseEvent = 0;
 
@@ -479,7 +479,7 @@ void _mouse_simulate_input(int delta_x, int delta_y, int buttons)
     }
 
     _mouse_idling = 0;
-    gMouseButtonsState = buttons;
+    last_buttons = buttons;
     previousEvent = gMouseEvent;
     gMouseEvent = 0;
 
@@ -703,4 +703,9 @@ void convertMouseWheelToArrowKey(int* keyCodePtr)
     }
 }
 
+int mouse_get_last_buttons()
+{
+    return last_buttons;
+}
+
 } // namespace fallout
diff --git a/src/mouse.h b/src/mouse.h
index 6b091c5..667250f 100644
--- a/src/mouse.h
+++ b/src/mouse.h
@@ -52,6 +52,7 @@ void mouseGetPositionInWindow(int win, int* x, int* y);
 bool mouseHitTestInWindow(int win, int left, int top, int right, int bottom);
 void mouseGetWheel(int* x, int* y);
 void convertMouseWheelToArrowKey(int* keyCodePtr);
+int mouse_get_last_buttons();
 
 } // namespace fallout
 
diff --git a/src/platform_compat.cc b/src/platform_compat.cc
index 5297592..b629fb6 100644
--- a/src/platform_compat.cc
+++ b/src/platform_compat.cc
@@ -239,6 +239,36 @@ gzFile compat_gzopen(const char* path, const char* mode)
     return gzopen(nativePath, mode);
 }
 
+char* compat_fgets(char* buffer, int maxCount, FILE* stream)
+{
+    buffer = fgets(buffer, maxCount, stream);
+
+    if (buffer != NULL) {
+        size_t len = strlen(buffer);
+        if (len >= 2 && buffer[len - 1] == '\n' && buffer[len - 2] == '\r') {
+            buffer[len - 2] = '\n';
+            buffer[len - 1] = '\0';
+        }
+    }
+
+    return buffer;
+}
+
+char* compat_gzgets(gzFile stream, char* buffer, int maxCount)
+{
+    buffer = gzgets(stream, buffer, maxCount);
+
+    if (buffer != NULL) {
+        size_t len = strlen(buffer);
+        if (len >= 2 && buffer[len - 1] == '\n' && buffer[len - 2] == '\r') {
+            buffer[len - 2] = '\n';
+            buffer[len - 1] = '\0';
+        }
+    }
+
+    return buffer;
+}
+
 int compat_remove(const char* path)
 {
     char nativePath[COMPAT_MAX_PATH];
diff --git a/src/platform_compat.h b/src/platform_compat.h
index be88974..9fb7574 100644
--- a/src/platform_compat.h
+++ b/src/platform_compat.h
@@ -35,6 +35,8 @@ int compat_mkdir(const char* path);
 unsigned int compat_timeGetTime();
 FILE* compat_fopen(const char* path, const char* mode);
 gzFile compat_gzopen(const char* path, const char* mode);
+char* compat_fgets(char* buffer, int maxCount, FILE* stream);
+char* compat_gzgets(gzFile stream, char* buffer, int maxCount);
 int compat_remove(const char* path);
 int compat_rename(const char* oldFileName, const char* newFileName);
 void compat_windows_path_to_native(char* path);
diff --git a/src/proto.cc b/src/proto.cc
index 86d767b..efb05b0 100644
--- a/src/proto.cc
+++ b/src/proto.cc
@@ -249,6 +249,12 @@ int _proto_list_str(int pid, char* proto_path)
     return 0;
 }
 
+// 0x49E984
+size_t proto_size(int type)
+{
+    return type >= 0 && type < OBJ_TYPE_COUNT ? _proto_sizes[type] : 0;
+}
+
 // 0x49E99C
 bool _proto_action_can_use(int pid)
 {
@@ -1704,12 +1710,10 @@ static int _proto_load_pid(int pid, Proto** protoPtr)
     return 0;
 }
 
-// allocate memory for proto of given type and adds it to proto cache
+// 0x4A1D98
 static int _proto_find_free_subnode(int type, Proto** protoPtr)
 {
-    size_t size = (type >= 0 && type < 11) ? _proto_sizes[type] : 0;
-
-    Proto* proto = (Proto*)internal_malloc(size);
+    Proto* proto = (Proto*)internal_malloc(proto_size(type));
     *protoPtr = proto;
     if (proto == NULL) {
         return -1;
diff --git a/src/proto.h b/src/proto.h
index c7f481d..d6f13e6 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -104,6 +104,7 @@ extern char* _proto_none_str;
 
 void _proto_make_path(char* path, int pid);
 int _proto_list_str(int pid, char* proto_path);
+size_t proto_size(int type);
 bool _proto_action_can_use(int pid);
 bool _proto_action_can_use_on(int pid);
 bool _proto_action_can_talk_to(int pid);
diff --git a/src/scripts.cc b/src/scripts.cc
index 3ac7e4b..7a35d39 100644
--- a/src/scripts.cc
+++ b/src/scripts.cc
@@ -29,6 +29,7 @@
 #include "proto.h"
 #include "proto_instance.h"
 #include "queue.h"
+#include "sfall_config.h"
 #include "stat.h"
 #include "svga.h"
 #include "tile.h"
@@ -265,6 +266,15 @@ static bool _set;
 // 0x667750
 static char _tempStr1[20];
 
+static int gStartYear;
+static int gStartMonth;
+static int gStartDay;
+
+static int gMovieTimerArtimer1;
+static int gMovieTimerArtimer2;
+static int gMovieTimerArtimer3;
+static int gMovieTimerArtimer4;
+
 // TODO: Make unsigned.
 //
 // Returns game time in ticks (1/10 second).
@@ -278,9 +288,9 @@ int gameTimeGetTime()
 // 0x4A3338
 void gameTimeGetDate(int* monthPtr, int* dayPtr, int* yearPtr)
 {
-    int year = (gGameTime / GAME_TIME_TICKS_PER_DAY + 24) / 365 + 2241;
-    int month = 6;
-    int day = (gGameTime / GAME_TIME_TICKS_PER_DAY + 24) % 365;
+    int year = (gGameTime / GAME_TIME_TICKS_PER_DAY + gStartDay) / 365 + gStartYear;
+    int month = gStartMonth;
+    int day = (gGameTime / GAME_TIME_TICKS_PER_DAY + gStartDay) % 365;
 
     while (1) {
         int daysInMonth = gGameTimeDaysPerMonth[month];
@@ -439,7 +449,7 @@ int _scriptsCheckGameEvents(int* moviePtr, int window)
         movieFlags = GAME_MOVIE_FADE_IN | GAME_MOVIE_STOP_MUSIC;
         endgame = true;
     } else {
-        if (day >= 360 || gameGetGlobalVar(GVAR_FALLOUT_2) >= 3) {
+        if (day >= gMovieTimerArtimer4 || gameGetGlobalVar(GVAR_FALLOUT_2) >= 3) {
             movie = MOVIE_ARTIMER4;
             if (!gameMovieIsSeen(MOVIE_ARTIMER4)) {
                 adjustRep = true;
@@ -447,13 +457,13 @@ int _scriptsCheckGameEvents(int* moviePtr, int window)
                 wmAreaSetVisibleState(CITY_DESTROYED_ARROYO, 1, 1);
                 wmAreaMarkVisitedState(CITY_DESTROYED_ARROYO, 2);
             }
-        } else if (day >= 270 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
+        } else if (day >= gMovieTimerArtimer3 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
             adjustRep = true;
             movie = MOVIE_ARTIMER3;
-        } else if (day >= 180 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
+        } else if (day >= gMovieTimerArtimer2 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
             adjustRep = true;
             movie = MOVIE_ARTIMER2;
-        } else if (day >= 90 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
+        } else if (day >= gMovieTimerArtimer1 && gameGetGlobalVar(GVAR_FALLOUT_2) != 3) {
             adjustRep = true;
             movie = MOVIE_ARTIMER1;
         }
@@ -1522,6 +1532,15 @@ int scriptsInit()
 
     messageListRepositorySetStandardMessageList(STANDARD_MESSAGE_LIST_SCRIPT, &gScrMessageList);
 
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_YEAR, &gStartYear);
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_MONTH, &gStartMonth);
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_DAY, &gStartDay);
+
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER1, &gMovieTimerArtimer1);
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER2, &gMovieTimerArtimer2);
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER3, &gMovieTimerArtimer3);
+    configGetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER4, &gMovieTimerArtimer4);
+
     return 0;
 }
 
diff --git a/src/sfall_config.cc b/src/sfall_config.cc
index c3c8f7e..c0f4b6c 100644
--- a/src/sfall_config.cc
+++ b/src/sfall_config.cc
@@ -27,6 +27,9 @@ bool sfallConfigInit(int argc, char** argv)
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_DUDE_NATIVE_LOOK_JUMPSUIT_FEMALE_KEY, "");
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_DUDE_NATIVE_LOOK_TRIBAL_MALE_KEY, "");
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_DUDE_NATIVE_LOOK_TRIBAL_FEMALE_KEY, "");
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_YEAR, 2241);
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_MONTH, 6);
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_START_DAY, 24);
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MAIN_MENU_BIG_FONT_COLOR_KEY, 0);
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MAIN_MENU_CREDITS_OFFSET_X_KEY, 0);
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MAIN_MENU_CREDITS_OFFSET_Y_KEY, 0);
@@ -50,6 +53,10 @@ bool sfallConfigInit(int argc, char** argv)
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_BURST_MOD_TARGET_MULTIPLIER_KEY, SFALL_CONFIG_BURST_MOD_DEFAULT_TARGET_MULTIPLIER);
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_BURST_MOD_TARGET_DIVISOR_KEY, SFALL_CONFIG_BURST_MOD_DEFAULT_TARGET_DIVISOR);
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_EXTRA_MESSAGE_LISTS_KEY, "");
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER1, 90);
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER2, 180);
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER3, 270);
+    configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER4, 360);
 
     char path[COMPAT_MAX_PATH];
     char* executable = argv[0];
diff --git a/src/sfall_config.h b/src/sfall_config.h
index 26d85cc..86aa7a7 100644
--- a/src/sfall_config.h
+++ b/src/sfall_config.h
@@ -13,6 +13,9 @@ namespace fallout {
 #define SFALL_CONFIG_DUDE_NATIVE_LOOK_JUMPSUIT_FEMALE_KEY "FemaleDefaultModel"
 #define SFALL_CONFIG_DUDE_NATIVE_LOOK_TRIBAL_MALE_KEY "MaleStartModel"
 #define SFALL_CONFIG_DUDE_NATIVE_LOOK_TRIBAL_FEMALE_KEY "FemaleStartModel"
+#define SFALL_CONFIG_START_YEAR "StartYear"
+#define SFALL_CONFIG_START_MONTH "StartMonth"
+#define SFALL_CONFIG_START_DAY "StartDay"
 #define SFALL_CONFIG_MAIN_MENU_BIG_FONT_COLOR_KEY "MainMenuBigFontColour"
 #define SFALL_CONFIG_MAIN_MENU_CREDITS_OFFSET_X_KEY "MainMenuCreditsOffsetX"
 #define SFALL_CONFIG_MAIN_MENU_CREDITS_OFFSET_Y_KEY "MainMenuCreditsOffsetY"
@@ -42,6 +45,10 @@ namespace fallout {
 #define SFALL_CONFIG_PLASTIC_EXPLOSIVE_MIN_DAMAGE_KEY "PlasticExplosive_DmgMin"
 #define SFALL_CONFIG_PLASTIC_EXPLOSIVE_MAX_DAMAGE_KEY "PlasticExplosive_DmgMax"
 #define SFALL_CONFIG_EXPLOSION_EMITS_LIGHT_KEY "ExplosionsEmitLight"
+#define SFALL_CONFIG_MOVIE_TIMER_ARTIMER1 "MovieTimer_artimer1"
+#define SFALL_CONFIG_MOVIE_TIMER_ARTIMER2 "MovieTimer_artimer2"
+#define SFALL_CONFIG_MOVIE_TIMER_ARTIMER3 "MovieTimer_artimer3"
+#define SFALL_CONFIG_MOVIE_TIMER_ARTIMER4 "MovieTimer_artimer4"
 #define SFALL_CONFIG_CITY_REPUTATION_LIST_KEY "CityRepsList"
 #define SFALL_CONFIG_UNARMED_FILE_KEY "UnarmedFile"
 #define SFALL_CONFIG_DAMAGE_MOD_FORMULA_KEY "DamageFormula"
diff --git a/src/sfall_opcodes.cc b/src/sfall_opcodes.cc
index d746f93..103d29f 100644
--- a/src/sfall_opcodes.cc
+++ b/src/sfall_opcodes.cc
@@ -1,19 +1,25 @@
 #include "sfall_opcodes.h"
 
+#include "animation.h"
 #include "art.h"
 #include "combat.h"
 #include "debug.h"
 #include "game.h"
+#include "input.h"
 #include "interface.h"
 #include "interpreter.h"
 #include "item.h"
 #include "message.h"
 #include "mouse.h"
 #include "object.h"
+#include "proto.h"
+#include "scripts.h"
 #include "sfall_global_vars.h"
 #include "sfall_lists.h"
 #include "stat.h"
 #include "svga.h"
+#include "tile.h"
+#include "worldmap.h"
 
 namespace fallout {
 
@@ -39,6 +45,17 @@ static void opReadByte(Program* program)
     programStackPushInteger(program, value);
 }
 
+// set_pc_base_stat
+static void op_set_pc_base_stat(Program* program)
+{
+    // CE: Implementation is different. Sfall changes value directly on the
+    // dude's proto, without calling |critterSetBaseStat|. This function has
+    // important call to update derived stats, which is not present in Sfall.
+    int value = programStackPopInteger(program);
+    int stat = programStackPopInteger(program);
+    critterSetBaseStat(gDude, stat, value);
+}
+
 // set_pc_extra_stat
 static void opSetPcBonusStat(Program* program)
 {
@@ -50,6 +67,16 @@ static void opSetPcBonusStat(Program* program)
     critterSetBonusStat(gDude, stat, value);
 }
 
+// get_pc_base_stat
+static void op_get_pc_base_stat(Program* program)
+{
+    // CE: Implementation is different. Sfall obtains value directly from
+    // dude's proto. This can have unforeseen consequences when dealing with
+    // current stats.
+    int stat = programStackPopInteger(program);
+    programStackPushInteger(program, critterGetBaseStat(gDude, stat));
+}
+
 // get_pc_extra_stat
 static void opGetPcBonusStat(Program* program)
 {
@@ -58,6 +85,28 @@ static void opGetPcBonusStat(Program* program)
     programStackPushInteger(program, value);
 }
 
+// get_year
+static void op_get_year(Program* program)
+{
+    int year;
+    gameTimeGetDate(nullptr, nullptr, &year);
+    programStackPushInteger(program, year);
+}
+
+// in_world_map
+static void op_in_world_map(Program* program)
+{
+    programStackPushInteger(program, GameMode::isInGameMode(GameMode::kWorldmap) ? 1 : 0);
+}
+
+// set_world_map_pos
+static void op_set_world_map_pos(Program* program)
+{
+    int y = programStackPopInteger(program);
+    int x = programStackPopInteger(program);
+    wmSetPartyWorldPos(x, y);
+}
+
 // active_hand
 static void opGetCurrentHand(Program* program)
 {
@@ -100,6 +149,103 @@ static void opGetGameMode(Program* program)
     programStackPushInteger(program, GameMode::getCurrentGameMode());
 }
 
+// get_uptime
+static void op_get_uptime(Program* program)
+{
+    programStackPushInteger(program, getTicks());
+}
+
+// set_car_current_town
+static void op_set_car_current_town(Program* program)
+{
+    int area = programStackPopInteger(program);
+    wmCarSetCurrentArea(area);
+}
+
+// get_bodypart_hit_modifier
+static void op_get_bodypart_hit_modifier(Program* program)
+{
+    int hit_location = programStackPopInteger(program);
+    programStackPushInteger(program, combat_get_hit_location_penalty(hit_location));
+}
+
+// set_bodypart_hit_modifier
+static void op_set_bodypart_hit_modifier(Program* program)
+{
+    int penalty = programStackPopInteger(program);
+    int hit_location = programStackPopInteger(program);
+    combat_set_hit_location_penalty(hit_location, penalty);
+}
+
+// sqrt
+static void op_sqrt(Program* program)
+{
+    ProgramValue programValue = programStackPopValue(program);
+    programStackPushFloat(program, sqrtf(programValue.asFloat()));
+}
+
+// abs
+static void op_abs(Program* program)
+{
+    ProgramValue programValue = programStackPopValue(program);
+
+    if (programValue.isInt()) {
+        programStackPushInteger(program, abs(programValue.integerValue));
+    } else {
+        programStackPushFloat(program, abs(programValue.asFloat()));
+    }
+}
+
+// get_proto_data
+static void op_get_proto_data(Program* program)
+{
+    size_t offset = static_cast<size_t>(programStackPopInteger(program));
+    int pid = programStackPopInteger(program);
+
+    Proto* proto;
+    if (protoGetProto(pid, &proto) != 0) {
+        debugPrint("op_get_proto_data: bad proto %d", pid);
+        programStackPushInteger(program, -1);
+        return;
+    }
+
+    // CE: Make sure the requested offset is within memory bounds and is
+    // properly aligned.
+    if (offset + sizeof(int) > proto_size(PID_TYPE(pid)) || offset % sizeof(int) != 0) {
+        debugPrint("op_get_proto_data: bad offset %d", offset);
+        programStackPushInteger(program, -1);
+        return;
+    }
+
+    int value = *reinterpret_cast<int*>(reinterpret_cast<unsigned char*>(proto) + offset);
+    programStackPushInteger(program, value);
+}
+
+// set_proto_data
+static void op_set_proto_data(Program* program)
+{
+    int value = programStackPopInteger(program);
+    size_t offset = static_cast<size_t>(programStackPopInteger(program));
+    int pid = programStackPopInteger(program);
+
+    Proto* proto;
+    if (protoGetProto(pid, &proto) != 0) {
+        debugPrint("op_set_proto_data: bad proto %d", pid);
+        programStackPushInteger(program, -1);
+        return;
+    }
+
+    // CE: Make sure the requested offset is within memory bounds and is
+    // properly aligned.
+    if (offset + sizeof(int) > proto_size(PID_TYPE(pid)) || offset % sizeof(int) != 0) {
+        debugPrint("op_set_proto_data: bad offset %d", offset);
+        programStackPushInteger(program, -1);
+        return;
+    }
+
+    *reinterpret_cast<int*>(reinterpret_cast<unsigned char*>(proto) + offset) = value;
+}
+
 // list_begin
 static void opListBegin(Program* program)
 {
@@ -251,6 +397,14 @@ static void opGetMouseY(Program* program)
     programStackPushInteger(program, y);
 }
 
+// get_mouse_buttons
+static void op_get_mouse_buttons(Program* program)
+{
+    // CE: Implementation is slightly different - it does not handle middle
+    // mouse button.
+    programStackPushInteger(program, mouse_get_last_buttons());
+}
+
 // get_screen_width
 static void opGetScreenWidth(Program* program)
 {
@@ -263,6 +417,17 @@ static void opGetScreenHeight(Program* program)
     programStackPushInteger(program, screenGetHeight());
 }
 
+// get_attack_type
+static void op_get_attack_type(Program* program)
+{
+    int hit_mode;
+    if (interface_get_current_attack_mode(&hit_mode)) {
+        programStackPushInteger(program, hit_mode);
+    } else {
+        programStackPushInteger(program, -1);
+    }
+}
+
 // atoi
 static void opParseInt(Program* program)
 {
@@ -270,6 +435,24 @@ static void opParseInt(Program* program)
     programStackPushInteger(program, static_cast<int>(strtol(string, nullptr, 0)));
 }
 
+// atof
+static void op_atof(Program* program)
+{
+    const char* string = programStackPopString(program);
+    programStackPushFloat(program, static_cast<float>(atof(string)));
+}
+
+// tile_under_cursor
+static void op_tile_under_cursor(Program* program)
+{
+    int x;
+    int y;
+    mouseGetPosition(&x, &y);
+
+    int tile = tileFromScreenXY(x, y, gElevation);
+    programStackPushInteger(program, tile);
+}
+
 // strlen
 static void opGetStringLength(Program* program)
 {
@@ -277,6 +460,22 @@ static void opGetStringLength(Program* program)
     programStackPushInteger(program, static_cast<int>(strlen(string)));
 }
 
+// pow (^)
+static void op_power(Program* program)
+{
+    ProgramValue expValue = programStackPopValue(program);
+    ProgramValue baseValue = programStackPopValue(program);
+
+    // CE: Implementation is slightly different, check.
+    float result = powf(baseValue.asFloat(), expValue.asFloat());
+
+    if (baseValue.isInt() && expValue.isInt()) {
+        programStackPushInteger(program, static_cast<int>(result));
+    } else {
+        programStackPushFloat(program, result);
+    }
+}
+
 // message_str_game
 static void opGetMessage(Program* program)
 {
@@ -298,6 +497,61 @@ static void opRound(Program* program)
     programStackPushInteger(program, integerValue);
 }
 
+enum BlockType {
+    BLOCKING_TYPE_BLOCK,
+    BLOCKING_TYPE_SHOOT,
+    BLOCKING_TYPE_AI,
+    BLOCKING_TYPE_SIGHT,
+    BLOCKING_TYPE_SCROLL,
+};
+
+PathBuilderCallback* get_blocking_func(int type)
+{
+    switch (type) {
+    case BLOCKING_TYPE_SHOOT:
+        return _obj_shoot_blocking_at;
+    case BLOCKING_TYPE_AI:
+        return _obj_ai_blocking_at;
+    case BLOCKING_TYPE_SIGHT:
+        return _obj_sight_blocking_at;
+    default:
+        return _obj_blocking_at;
+    }
+}
+
+// obj_blocking_line
+static void op_make_straight_path(Program* program)
+{
+    int type = programStackPopInteger(program);
+    int dest = programStackPopInteger(program);
+    Object* object = static_cast<Object*>(programStackPopPointer(program));
+
+    int flags = type == BLOCKING_TYPE_SHOOT ? 32 : 0;
+
+    Object* obstacle = nullptr;
+    _make_straight_path_func(object, object->tile, dest, nullptr, &obstacle, flags, get_blocking_func(type));
+    programStackPushPointer(program, obstacle);
+}
+
+// obj_blocking_tile
+static void op_obj_blocking_at(Program* program)
+{
+    int type = programStackPopInteger(program);
+    int elevation = programStackPopInteger(program);
+    int tile = programStackPopInteger(program);
+
+    PathBuilderCallback* func = get_blocking_func(type);
+    Object* obstacle = func(NULL, tile, elevation);
+    if (obstacle != NULL) {
+        if (type == BLOCKING_TYPE_SHOOT) {
+            if ((obstacle->flags & OBJECT_SHOOT_THRU) != 0) {
+                obstacle = nullptr;
+            }
+        }
+    }
+    programStackPushPointer(program, obstacle);
+}
+
 // art_exists
 static void opArtExists(Program* program)
 {
@@ -305,15 +559,50 @@ static void opArtExists(Program* program)
     programStackPushInteger(program, artExists(fid));
 }
 
+// div (/)
+static void op_div(Program* program)
+{
+    ProgramValue divisorValue = programStackPopValue(program);
+    ProgramValue dividendValue = programStackPopValue(program);
+
+    if (divisorValue.integerValue == 0) {
+        debugPrint("Division by zero");
+
+        // TODO: Looks like execution is not halted in Sfall's div, check.
+        programStackPushInteger(program, 0);
+        return;
+    }
+
+    if (dividendValue.isFloat() || divisorValue.isFloat()) {
+        programStackPushFloat(program, dividendValue.asFloat() / divisorValue.asFloat());
+    } else {
+        // Unsigned divison.
+        programStackPushInteger(program, static_cast<unsigned int>(dividendValue.integerValue) / static_cast<unsigned int>(divisorValue.integerValue));
+    }
+}
+
 void sfallOpcodesInit()
 {
     interpreterRegisterOpcode(0x8156, opReadByte);
+    interpreterRegisterOpcode(0x815A, op_set_pc_base_stat);
     interpreterRegisterOpcode(0x815B, opSetPcBonusStat);
+    interpreterRegisterOpcode(0x815C, op_get_pc_base_stat);
     interpreterRegisterOpcode(0x815D, opGetPcBonusStat);
+    interpreterRegisterOpcode(0x8163, op_get_year);
+    interpreterRegisterOpcode(0x8170, op_in_world_map);
+    interpreterRegisterOpcode(0x8172, op_set_world_map_pos);
     interpreterRegisterOpcode(0x8193, opGetCurrentHand);
     interpreterRegisterOpcode(0x819D, opSetGlobalVar);
     interpreterRegisterOpcode(0x819E, opGetGlobalInt);
     interpreterRegisterOpcode(0x81AF, opGetGameMode);
+    interpreterRegisterOpcode(0x81B3, op_get_uptime);
+    interpreterRegisterOpcode(0x81B6, op_set_car_current_town);
+    interpreterRegisterOpcode(0x81DF, op_get_bodypart_hit_modifier);
+    interpreterRegisterOpcode(0x81E0, op_set_bodypart_hit_modifier);
+    interpreterRegisterOpcode(0x81EC, op_sqrt);
+    interpreterRegisterOpcode(0x81ED, op_abs);
+    interpreterRegisterOpcode(0x8204, op_get_proto_data);
+    interpreterRegisterOpcode(0x8205, op_set_proto_data);
     interpreterRegisterOpcode(0x820D, opListBegin);
     interpreterRegisterOpcode(0x820E, opListNext);
     interpreterRegisterOpcode(0x820F, opListEnd);
@@ -326,13 +615,21 @@ void sfallOpcodesInit()
     interpreterRegisterOpcode(0x821A, opSetWeaponAmmoCount);
     interpreterRegisterOpcode(0x821C, opGetMouseX);
     interpreterRegisterOpcode(0x821D, opGetMouseY);
+    interpreterRegisterOpcode(0x821E, op_get_mouse_buttons);
     interpreterRegisterOpcode(0x8220, opGetScreenWidth);
     interpreterRegisterOpcode(0x8221, opGetScreenHeight);
+    interpreterRegisterOpcode(0x8228, op_get_attack_type);
     interpreterRegisterOpcode(0x8237, opParseInt);
+    interpreterRegisterOpcode(0x8238, op_atof);
+    interpreterRegisterOpcode(0x824B, op_tile_under_cursor);
     interpreterRegisterOpcode(0x824F, opGetStringLength);
+    interpreterRegisterOpcode(0x8263, op_power);
     interpreterRegisterOpcode(0x826B, opGetMessage);
     interpreterRegisterOpcode(0x8267, opRound);
+    interpreterRegisterOpcode(0x826E, op_make_straight_path);
+    interpreterRegisterOpcode(0x826F, op_obj_blocking_at);
     interpreterRegisterOpcode(0x8274, opArtExists);
+    interpreterRegisterOpcode(0x827F, op_div);
 }
 
 void sfallOpcodesExit()
diff --git a/src/sound.cc b/src/sound.cc
index 353b605..0576358 100644
--- a/src/sound.cc
+++ b/src/sound.cc
@@ -1,5 +1,6 @@
 #include "sound.h"
 
+#include <fcntl.h>
 #include <limits.h>
 #include <math.h>
 #include <stdlib.h>
@@ -8,7 +9,6 @@
 #ifdef _WIN32
 #include <io.h>
 #else
-#include <fcntl.h>
 #include <unistd.h>
 #endif
 
@@ -49,7 +49,7 @@ static long soundFileSize(int fileHandle);
 static long soundTellData(int fileHandle);
 static int soundWriteData(int fileHandle, const void* buf, unsigned int size);
 static int soundReadData(int fileHandle, void* buf, unsigned int size);
-static int soundOpenData(const char* filePath, int flags);
+static int soundOpenData(const char* filePath, int* channels, int* sampleRate);
 static long soundSeekData(int fileHandle, long offset, int origin);
 static int soundCloseData(int fileHandle);
 static char* soundFileManglerDefaultImpl(char* fname);
@@ -223,8 +223,16 @@ static int soundReadData(int fileHandle, void* buf, unsigned int size)
 }
 
 // 0x4AC768
-static int soundOpenData(const char* filePath, int flags)
+static int soundOpenData(const char* filePath, int* channels, int* sampleRate)
 {
+    int flags;
+
+#ifdef _WIN32
+    flags = _O_RDONLY | _O_BINARY;
+#else
+    flags = O_RDONLY;
+#endif
+
     return open(filePath, flags);
 }
 
@@ -608,7 +616,7 @@ int soundLoad(Sound* sound, char* filePath)
         return gSoundLastError;
     }
 
-    sound->io.fd = sound->io.open(gSoundFileNameMangler(filePath), 0x0200);
+    sound->io.fd = sound->io.open(gSoundFileNameMangler(filePath), &(sound->channels), &(sound->rate));
     if (sound->io.fd == -1) {
         gSoundLastError = SOUND_FILE_NOT_FOUND;
         return gSoundLastError;
diff --git a/src/sound.h b/src/sound.h
index ab81e63..427b5f8 100644
--- a/src/sound.h
+++ b/src/sound.h
@@ -46,7 +46,7 @@ typedef enum SoundError {
     SOUND_ERR_COUNT,
 } SoundError;
 
-typedef int SoundOpenProc(const char* filePath, int flags);
+typedef int SoundOpenProc(const char* filePath, int* channels, int* sampleRate);
 typedef int SoundCloseProc(int fileHandle);
 typedef int SoundReadProc(int fileHandle, void* buf, unsigned int size);
 typedef int SoundWriteProc(int fileHandle, const void* buf, unsigned int size);
diff --git a/src/sound_decoder.cc b/src/sound_decoder.cc
index 3b2c33a..83b020a 100644
--- a/src/sound_decoder.cc
+++ b/src/sound_decoder.cc
@@ -34,13 +34,15 @@ static int ReadBand_Fmt24(SoundDecoder* soundDecoder, int offset, int bits);
 static int ReadBand_Fmt26(SoundDecoder* soundDecoder, int offset, int bits);
 static int ReadBand_Fmt27(SoundDecoder* soundDecoder, int offset, int bits);
 static int ReadBand_Fmt29(SoundDecoder* soundDecoder, int offset, int bits);
-static int ReadBands(SoundDecoder* ptr);
+static bool ReadBands(SoundDecoder* soundDecoder);
 static void untransform_subband0(unsigned char* a1, unsigned char* a2, int a3, int a4);
 static void untransform_subband(unsigned char* a1, unsigned char* a2, int a3, int a4);
 static void untransform_all(SoundDecoder* soundDecoder);
+static bool soundDecoderFill(SoundDecoder* soundDecoder);
 
 static inline void soundDecoderRequireBits(SoundDecoder* soundDecoder, int bits);
 static inline void soundDecoderDropBits(SoundDecoder* soundDecoder, int bits);
+static int ReadBand_Fmt31(SoundDecoder* soundDecoder, int offset, int bits);
 
 // 0x51E328
 static int gSoundDecodersCount = 0;
@@ -78,7 +80,7 @@ static ReadBandFunc _ReadBand_tbl[32] = {
     ReadBand_Fail,
     ReadBand_Fmt29,
     ReadBand_Fail,
-    ReadBand_Fail,
+    ReadBand_Fmt31,
 };
 
 // 0x6AD960
@@ -751,7 +753,7 @@ static int ReadBand_Fmt29(SoundDecoder* soundDecoder, int offset, int bits)
 }
 
 // 0x4D493C
-static int ReadBands(SoundDecoder* soundDecoder)
+static bool ReadBands(SoundDecoder* soundDecoder)
 {
     int v9;
     int v15;
@@ -797,10 +799,10 @@ static int ReadBands(SoundDecoder* soundDecoder)
 
         fn = _ReadBand_tbl[bits];
         if (!fn(soundDecoder, index, bits)) {
-            return 0;
+            return false;
         }
     }
-    return 1;
+    return true;
 }
 
 // 0x4D4ADC
@@ -1043,53 +1045,67 @@ static void untransform_all(SoundDecoder* soundDecoder)
     }
 }
 
+// NOTE: Inlined.
+//
+// 0x4D4F58
+static bool soundDecoderFill(SoundDecoder* soundDecoder)
+{
+    // CE: Implementation is slightly different. `ReadBands` now handles new
+    // Fmt31 used in some Russian localizations. The appropriate handler acts as
+    // both decoder and transformer, so there is no need to untransform bands
+    // once again. This approach assumes band 31 is never used by standard acms
+    // and mods.
+    if (ReadBands(soundDecoder)) {
+        untransform_all(soundDecoder);
+    }
+
+    soundDecoder->file_cnt -= soundDecoder->total_samples;
+    soundDecoder->samp_ptr = soundDecoder->samples;
+    soundDecoder->samp_cnt = soundDecoder->total_samples;
+
+    if (soundDecoder->file_cnt < 0) {
+        soundDecoder->samp_cnt += soundDecoder->file_cnt;
+        soundDecoder->file_cnt = 0;
+    }
+
+    return true;
+}
+
 // 0x4D4FA0
 size_t soundDecoderDecode(SoundDecoder* soundDecoder, void* buffer, size_t size)
 {
     unsigned char* dest;
-    unsigned char* v5;
-    int v6;
-    int v4;
+    unsigned char* samp_ptr;
+    int samp_cnt;
 
     dest = (unsigned char*)buffer;
-    v4 = 0;
-    v5 = soundDecoder->samp_ptr;
-    v6 = soundDecoder->samp_cnt;
+    samp_ptr = soundDecoder->samp_ptr;
+    samp_cnt = soundDecoder->samp_cnt;
 
     size_t bytesRead;
     for (bytesRead = 0; bytesRead < size; bytesRead += 2) {
-        if (!v6) {
-            if (!soundDecoder->file_cnt) {
+        if (samp_cnt == 0) {
+            if (soundDecoder->file_cnt == 0) {
                 break;
             }
 
-            if (!ReadBands(soundDecoder)) {
+            // NOTE: Uninline.
+            if (!soundDecoderFill(soundDecoder)) {
                 break;
             }
 
-            untransform_all(soundDecoder);
-
-            soundDecoder->file_cnt -= soundDecoder->total_samples;
-            soundDecoder->samp_ptr = soundDecoder->samples;
-            soundDecoder->samp_cnt = soundDecoder->total_samples;
-
-            if (soundDecoder->file_cnt < 0) {
-                soundDecoder->samp_cnt += soundDecoder->file_cnt;
-                soundDecoder->file_cnt = 0;
-            }
-
-            v5 = soundDecoder->samp_ptr;
-            v6 = soundDecoder->samp_cnt;
+            samp_ptr = soundDecoder->samp_ptr;
+            samp_cnt = soundDecoder->samp_cnt;
         }
 
-        int v13 = *(int*)v5;
-        v5 += 4;
-        *(unsigned short*)(dest + bytesRead) = (v13 >> soundDecoder->levels) & 0xFFFF;
-        v6--;
+        int sample = *(int*)samp_ptr;
+        samp_ptr += 4;
+        *(unsigned short*)(dest + bytesRead) = (sample >> soundDecoder->levels) & 0xFFFF;
+        samp_cnt--;
     }
 
-    soundDecoder->samp_ptr = v5;
-    soundDecoder->samp_cnt = v6;
+    soundDecoder->samp_ptr = samp_ptr;
+    soundDecoder->samp_cnt = samp_cnt;
 
     return bytesRead;
 }
@@ -1259,4 +1275,22 @@ static inline void soundDecoderDropBits(SoundDecoder* soundDecoder, int bits)
     soundDecoder->bits -= bits;
 }
 
+static int ReadBand_Fmt31(SoundDecoder* soundDecoder, int offset, int bits)
+{
+    int* samples = (int*)soundDecoder->samples;
+
+    int remaining_samples = soundDecoder->total_samples;
+    while (remaining_samples != 0) {
+        soundDecoderRequireBits(soundDecoder, 16);
+        int value = soundDecoder->hold & 0xFFFF;
+        soundDecoderDropBits(soundDecoder, 16);
+
+        *samples++ = (value << 16) >> (16 - soundDecoder->levels);
+
+        remaining_samples--;
+    }
+
+    return 0;
+}
+
 } // namespace fallout
diff --git a/src/sound_effects_cache.cc b/src/sound_effects_cache.cc
index 26aead6..30f91ae 100644
--- a/src/sound_effects_cache.cc
+++ b/src/sound_effects_cache.cc
@@ -154,7 +154,7 @@ void soundEffectsCacheFlush()
 
 // sfxc_cached_open
 // 0x4A915C
-int soundEffectsCacheFileOpen(const char* fname, int mode)
+int soundEffectsCacheFileOpen(const char* fname, int* channels, int* sampleRate)
 {
     if (_sfxc_files_open >= SOUND_EFFECTS_MAX_COUNT) {
         return -1;
diff --git a/src/sound_effects_cache.h b/src/sound_effects_cache.h
index e6e0972..579c856 100644
--- a/src/sound_effects_cache.h
+++ b/src/sound_effects_cache.h
@@ -11,7 +11,7 @@ int soundEffectsCacheInit(int cache_size, const char* effectsPath);
 void soundEffectsCacheExit();
 int soundEffectsCacheInitialized();
 void soundEffectsCacheFlush();
-int soundEffectsCacheFileOpen(const char* fname, int mode);
+int soundEffectsCacheFileOpen(const char* fname, int* channels, int* sampleRate);
 int soundEffectsCacheFileClose(int handle);
 int soundEffectsCacheFileRead(int handle, void* buf, unsigned int size);
 int soundEffectsCacheFileWrite(int handle, const void* buf, unsigned int size);
diff --git a/src/tile.cc b/src/tile.cc
index a7e98aa..af68a39 100644
--- a/src/tile.cc
+++ b/src/tile.cc
@@ -5,6 +5,7 @@
 #include <string.h>
 
 #include <algorithm>
+#include <stack>
 
 #include "art.h"
 #include "color.h"
@@ -49,11 +50,16 @@ typedef struct UpsideDownTriangle {
     int field_8;
 } UpsideDownTriangle;
 
+struct roof_fill_task {
+    int x;
+    int y;
+};
+
 static void tileSetBorder(int windowWidth, int windowHeight, int hexGridWidth, int hexGridHeight);
 static void tileRefreshMapper(Rect* rect, int elevation);
 static void tileRefreshGame(Rect* rect, int elevation);
-static void roof_fill_on(int x, int y, int elevation);
-static void roof_fill_off(int x, int y, int elevation);
+static void roof_fill_push_task_if_in_bounds(std::stack<roof_fill_task>& tasks_stack, int x, int y);
+static void roof_fill_off_process_task(std::stack<roof_fill_task>& tasks_stack, int elevation, bool on);
 static void tileRenderRoof(int fid, int x, int y, Rect* rect, int light);
 static void _draw_grid(int tile, int elevation, Rect* rect);
 static void tileRenderFloor(int fid, int x, int y, Rect* rect);
@@ -1258,27 +1264,39 @@ void tileRenderRoofsInRect(Rect* rect, int elevation)
     }
 }
 
-// 0x4B22D0
-static void roof_fill_on(int x, int y, int elevation)
+static void roof_fill_push_task_if_in_bounds(std::stack<roof_fill_task>& tasks_stack, int x, int y)
 {
     if (x >= 0 && x < gSquareGridWidth && y >= 0 && y < gSquareGridHeight) {
-        int squareTileIndex = gSquareGridWidth * y + x;
-        int squareTile = gTileSquares[elevation]->field_0[squareTileIndex];
-        int roof = (squareTile >> 16) & 0xFFFF;
+        tasks_stack.push(roof_fill_task { x, y });
+    };
+};
 
-        int id = roof & 0xFFF;
-        if (buildFid(OBJ_TYPE_TILE, id, 0, 0, 0) != buildFid(OBJ_TYPE_TILE, 1, 0, 0, 0)) {
-            int flag = (roof & 0xF000) >> 12;
-            if ((flag & 0x01) != 0) {
+static void roof_fill_off_process_task(std::stack<roof_fill_task>& tasks_stack, int elevation, bool on)
+{
+    auto [x, y] = tasks_stack.top();
+    tasks_stack.pop();
+
+    int squareTileIndex = gSquareGridWidth * y + x;
+    int squareTile = gTileSquares[elevation]->field_0[squareTileIndex];
+    int roof = (squareTile >> 16) & 0xFFFF;
+
+    int id = roof & 0xFFF;
+    if (buildFid(OBJ_TYPE_TILE, id, 0, 0, 0) != buildFid(OBJ_TYPE_TILE, 1, 0, 0, 0)) {
+        int flag = (roof & 0xF000) >> 12;
+
+        if (on ? ((flag & 0x01) != 0) : ((flag & 0x03) == 0)) {
+            if (on) {
                 flag &= ~0x01;
-
-                gTileSquares[elevation]->field_0[squareTileIndex] = (squareTile & 0xFFFF) | (((flag << 12) | id) << 16);
-
-                roof_fill_on(x - 1, y, elevation);
-                roof_fill_on(x + 1, y, elevation);
-                roof_fill_on(x, y - 1, elevation);
-                roof_fill_on(x, y + 1, elevation);
+            } else {
+                flag |= 0x01;
             }
+
+            gTileSquares[elevation]->field_0[squareTileIndex] = (squareTile & 0xFFFF) | (((flag << 12) | id) << 16);
+
+            roof_fill_push_task_if_in_bounds(tasks_stack, x - 1, y);
+            roof_fill_push_task_if_in_bounds(tasks_stack, x + 1, y);
+            roof_fill_push_task_if_in_bounds(tasks_stack, x, y - 1);
+            roof_fill_push_task_if_in_bounds(tasks_stack, x, y + 1);
         }
     }
 }
@@ -1286,35 +1304,12 @@ static void roof_fill_on(int x, int y, int elevation)
 // 0x4B23D4
 void tile_fill_roof(int x, int y, int elevation, bool on)
 {
-    if (on) {
-        roof_fill_on(x, y, elevation);
-    } else {
-        roof_fill_off(x, y, elevation);
-    }
-}
+    std::stack<roof_fill_task> tasks_stack;
 
-// 0x4B23DC
-static void roof_fill_off(int x, int y, int elevation)
-{
-    if (x >= 0 && x < gSquareGridWidth && y >= 0 && y < gSquareGridHeight) {
-        int squareTileIndex = gSquareGridWidth * y + x;
-        int squareTile = gTileSquares[elevation]->field_0[squareTileIndex];
-        int roof = (squareTile >> 16) & 0xFFFF;
+    roof_fill_push_task_if_in_bounds(tasks_stack, x, y);
 
-        int id = roof & 0xFFF;
-        if (buildFid(OBJ_TYPE_TILE, id, 0, 0, 0) != buildFid(OBJ_TYPE_TILE, 1, 0, 0, 0)) {
-            int flag = (roof & 0xF000) >> 12;
-            if ((flag & 0x03) == 0) {
-                flag |= 0x01;
-
-                gTileSquares[elevation]->field_0[squareTileIndex] = (squareTile & 0xFFFF) | (((flag << 12) | id) << 16);
-
-                roof_fill_off(x - 1, y, elevation);
-                roof_fill_off(x + 1, y, elevation);
-                roof_fill_off(x, y - 1, elevation);
-                roof_fill_off(x, y + 1, elevation);
-            }
-        }
+    while (!tasks_stack.empty()) {
+        roof_fill_off_process_task(tasks_stack, elevation, on);
     }
 }
 
diff --git a/src/window_manager.cc b/src/window_manager.cc
index 101186a..e0f170a 100644
--- a/src/window_manager.cc
+++ b/src/window_manager.cc
@@ -25,8 +25,8 @@ namespace fallout {
 
 #define MAX_WINDOW_COUNT (50)
 
-// The maximum number of radio groups.
-#define RADIO_GROUP_LIST_CAPACITY (64)
+// The maximum number of button groups.
+#define BUTTON_GROUP_LIST_CAPACITY (64)
 
 static void windowFree(int win);
 static void _win_buffering(bool a1);
@@ -39,13 +39,13 @@ static int paletteOpenFileImpl(const char* path, int flags);
 static int paletteReadFileImpl(int fd, void* buf, size_t count);
 static int paletteCloseFileImpl(int fd);
 static Button* buttonCreateInternal(int win, int x, int y, int width, int height, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, int flags, unsigned char* up, unsigned char* dn, unsigned char* hover);
-static int _GNW_check_buttons(Window* window, int* out_a2);
+static int _GNW_check_buttons(Window* window, int* keyCodePtr);
 static bool _button_under_mouse(Button* button, Rect* rect);
 static void buttonFree(Button* ptr);
 static int button_new_id();
-static int _win_group_check_buttons(int a1, int* a2, int a3, void (*a4)(int));
+static int _win_group_check_buttons(int buttonCount, int* btns, int maxChecked, RadioButtonCallback* func);
 static int _button_check_group(Button* button);
-static void _button_draw(Button* button, Window* window, unsigned char* data, int a4, Rect* a5, int a6);
+static void _button_draw(Button* button, Window* window, unsigned char* data, bool draw, Rect* bound, bool sound);
 static void _GNW_button_refresh(Window* window, Rect* rect);
 
 // 0x50FA30
@@ -112,7 +112,7 @@ static int _doing_refresh_all;
 static void* _GNW_texture;
 
 // 0x6ADF40
-static RadioGroup gRadioGroups[RADIO_GROUP_LIST_CAPACITY];
+static ButtonGroup gButtonGroups[BUTTON_GROUP_LIST_CAPACITY];
 
 // 0x4D5C30
 int windowManagerInit(VideoSystemInitProc* videoSystemInitProc, VideoSystemExitProc* videoSystemExitProc, int a3)
@@ -504,15 +504,12 @@ void windowDrawBorder(int win)
 }
 
 // 0x4D684C
-void windowDrawText(int win, const char* str, int a3, int x, int y, int a6)
+void windowDrawText(int win, const char* str, int width, int x, int y, int color)
 {
-    int v7;
-    int v14;
     unsigned char* buf;
-    int v27;
+    int textColor;
 
     Window* window = windowGetWindow(win);
-    v7 = a3;
 
     if (!gWindowSystemInitialized) {
         return;
@@ -522,52 +519,51 @@ void windowDrawText(int win, const char* str, int a3, int x, int y, int a6)
         return;
     }
 
-    if (a3 == 0) {
-        if (a6 & 0x040000) {
-            v7 = fontGetMonospacedStringWidth(str);
+    if (width == 0) {
+        if (color & 0x040000) {
+            width = fontGetMonospacedStringWidth(str);
         } else {
-            v7 = fontGetStringWidth(str);
+            width = fontGetStringWidth(str);
         }
     }
 
-    if (v7 + x > window->width) {
-        if (!(a6 & 0x04000000)) {
+    if (width + x > window->width) {
+        if (!(color & 0x04000000)) {
             return;
         }
 
-        v7 = window->width - x;
+        width = window->width - x;
     }
 
     buf = window->buffer + x + y * window->width;
 
-    v14 = fontGetLineHeight();
-    if (v14 + y > window->height) {
+    if (fontGetLineHeight() + y > window->height) {
         return;
     }
 
-    if (!(a6 & 0x02000000)) {
+    if (!(color & 0x02000000)) {
         if (window->color == 256 && _GNW_texture != NULL) {
-            _buf_texture(buf, v7, fontGetLineHeight(), window->width, _GNW_texture, window->tx + x, window->ty + y);
+            _buf_texture(buf, width, fontGetLineHeight(), window->width, _GNW_texture, window->tx + x, window->ty + y);
         } else {
-            bufferFill(buf, v7, fontGetLineHeight(), window->width, window->color);
+            bufferFill(buf, width, fontGetLineHeight(), window->width, window->color);
         }
     }
 
-    if (a6 & 0xFF00) {
-        int t = (a6 & 0xFF00) >> 8;
-        v27 = (a6 & ~0xFFFF) | _colorTable[_GNW_wcolor[t]];
+    if (color & 0xFF00) {
+        int t = (color & 0xFF00) >> 8;
+        textColor = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[t]];
     } else {
-        v27 = a6;
+        textColor = color;
     }
 
-    fontDrawText(buf, str, v7, window->width, v27);
+    fontDrawText(buf, str, width, window->width, textColor);
 
-    if (a6 & 0x01000000) {
+    if (color & 0x01000000) {
         // TODO: Check.
         Rect rect;
         rect.left = window->rect.left + x;
         rect.top = window->rect.top + y;
-        rect.right = rect.left + v7;
+        rect.right = rect.left + width;
         rect.bottom = rect.top + fontGetLineHeight();
         _GNW_win_refresh(window, &rect, NULL);
     }
@@ -628,7 +624,7 @@ void windowDrawRect(int win, int left, int top, int right, int bottom, int color
 }
 
 // 0x4D6CC8
-void windowFill(int win, int x, int y, int width, int height, int a6)
+void windowFill(int win, int x, int y, int width, int height, int color)
 {
     Window* window = windowGetWindow(win);
 
@@ -640,19 +636,19 @@ void windowFill(int win, int x, int y, int width, int height, int a6)
         return;
     }
 
-    if (a6 == 256) {
+    if (color == 256) {
         if (_GNW_texture != NULL) {
             _buf_texture(window->buffer + window->width * y + x, width, height, window->width, _GNW_texture, x + window->tx, y + window->ty);
         } else {
-            a6 = _colorTable[_GNW_wcolor[0]] & 0xFF;
+            color = _colorTable[_GNW_wcolor[0]] & 0xFF;
         }
-    } else if ((a6 & 0xFF00) != 0) {
-        int v1 = (a6 & 0xFF00) >> 8;
-        a6 = (a6 & ~0xFFFF) | _colorTable[_GNW_wcolor[v1]];
+    } else if ((color & 0xFF00) != 0) {
+        int v1 = (color & 0xFF00) >> 8;
+        color = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[v1]];
     }
 
-    if (a6 < 256) {
-        bufferFill(window->buffer + window->width * y + x, width, height, window->width, a6);
+    if (color < 256) {
+        bufferFill(window->buffer + window->width * y + x, width, height, window->width, color);
     }
 }
 
@@ -1367,12 +1363,12 @@ int buttonCreate(int win, int x, int y, int width, int height, int mouseEnterEve
         return -1;
     }
 
-    Button* button = buttonCreateInternal(win, x, y, width, height, mouseEnterEventCode, mouseExitEventCode, mouseDownEventCode, mouseUpEventCode, flags | BUTTON_FLAG_0x010000, up, dn, hover);
+    Button* button = buttonCreateInternal(win, x, y, width, height, mouseEnterEventCode, mouseExitEventCode, mouseDownEventCode, mouseUpEventCode, flags | BUTTON_FLAG_GRAPHIC, up, dn, hover);
     if (button == NULL) {
         return -1;
     }
 
-    _button_draw(button, window, button->normalImage, 0, NULL, 0);
+    _button_draw(button, window, button->normalImage, false, NULL, false);
 
     return button->id;
 }
@@ -1469,7 +1465,7 @@ int _win_register_text_button(int win, int x, int y, int mouseEnterEventCode, in
         return -1;
     }
 
-    _button_draw(button, window, button->normalImage, 0, NULL, 0);
+    _button_draw(button, window, button->normalImage, false, NULL, false);
 
     return button->id;
 }
@@ -1494,7 +1490,7 @@ int _win_register_button_disable(int btn, unsigned char* up, unsigned char* down
 }
 
 // 0x4D86A8
-int _win_register_button_image(int btn, unsigned char* up, unsigned char* down, unsigned char* hover, int a5)
+int _win_register_button_image(int btn, unsigned char* up, unsigned char* down, unsigned char* hover, bool draw)
 {
     if (!gWindowSystemInitialized) {
         return -1;
@@ -1510,7 +1506,7 @@ int _win_register_button_image(int btn, unsigned char* up, unsigned char* down,
         return -1;
     }
 
-    if (!(button->flags & BUTTON_FLAG_0x010000)) {
+    if (!(button->flags & BUTTON_FLAG_GRAPHIC)) {
         return -1;
     }
 
@@ -1527,7 +1523,7 @@ int _win_register_button_image(int btn, unsigned char* up, unsigned char* down,
     button->pressedImage = down;
     button->hoverImage = hover;
 
-    _button_draw(button, window, button->currentImage, a5, NULL, 0);
+    _button_draw(button, window, button->currentImage, draw, NULL, false);
 
     return 0;
 }
@@ -1590,7 +1586,7 @@ int buttonSetRightMouseCallbacks(int btn, int rightMouseDownEventCode, int right
 // These callbacks can be triggered several times during tracking if mouse leaves button's rectangle without releasing mouse buttons.
 //
 // 0x4D87F8
-int buttonSetCallbacks(int btn, ButtonCallback* onPressed, ButtonCallback* onUnpressed)
+int buttonSetCallbacks(int btn, ButtonCallback* pressSoundFunc, ButtonCallback* releaseSoundFunc)
 {
     if (!gWindowSystemInitialized) {
         return -1;
@@ -1601,8 +1597,8 @@ int buttonSetCallbacks(int btn, ButtonCallback* onPressed, ButtonCallback* onUnp
         return -1;
     }
 
-    button->onPressed = onPressed;
-    button->onUnpressed = onUnpressed;
+    button->pressSoundFunc = pressSoundFunc;
+    button->releaseSoundFunc = releaseSoundFunc;
 
     return 0;
 }
@@ -1676,9 +1672,9 @@ Button* buttonCreateInternal(int win, int x, int y, int width, int height, int m
     button->leftMouseUpProc = NULL;
     button->rightMouseDownProc = NULL;
     button->rightMouseUpProc = NULL;
-    button->onPressed = NULL;
-    button->onUnpressed = NULL;
-    button->radioGroup = NULL;
+    button->pressSoundFunc = NULL;
+    button->releaseSoundFunc = NULL;
+    button->buttonGroup = NULL;
     button->prev = NULL;
 
     button->next = window->buttonListHead;
@@ -1702,7 +1698,7 @@ bool _win_button_down(int btn)
         return false;
     }
 
-    if ((button->flags & BUTTON_FLAG_0x01) != 0 && (button->flags & BUTTON_FLAG_0x020000) != 0) {
+    if ((button->flags & BUTTON_FLAG_0x01) != 0 && (button->flags & BUTTON_FLAG_CHECKED) != 0) {
         return true;
     }
 
@@ -1751,10 +1747,10 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                     *keyCodePtr = prevHoveredButton->mouseExitEventCode;
                 }
 
-                if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_0x020000)) {
-                    _button_draw(prevHoveredButton, window, prevHoveredButton->pressedImage, 1, NULL, 1);
+                if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_CHECKED)) {
+                    _button_draw(prevHoveredButton, window, prevHoveredButton->pressedImage, true, NULL, true);
                 } else {
-                    _button_draw(prevHoveredButton, window, prevHoveredButton->normalImage, 1, NULL, 1);
+                    _button_draw(prevHoveredButton, window, prevHoveredButton->normalImage, true, NULL, true);
                 }
 
                 window->hoveredButton = NULL;
@@ -1778,10 +1774,10 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                     *keyCodePtr = prevClickedButton->mouseEnterEventCode;
                 }
 
-                if ((prevClickedButton->flags & BUTTON_FLAG_0x01) && (prevClickedButton->flags & BUTTON_FLAG_0x020000)) {
-                    _button_draw(prevClickedButton, window, prevClickedButton->pressedImage, 1, NULL, 1);
+                if ((prevClickedButton->flags & BUTTON_FLAG_0x01) && (prevClickedButton->flags & BUTTON_FLAG_CHECKED)) {
+                    _button_draw(prevClickedButton, window, prevClickedButton->pressedImage, true, NULL, true);
                 } else {
-                    _button_draw(prevClickedButton, window, prevClickedButton->normalImage, 1, NULL, 1);
+                    _button_draw(prevClickedButton, window, prevClickedButton->normalImage, true, NULL, true);
                 }
 
                 window->hoveredButton = prevClickedButton;
@@ -1812,10 +1808,10 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                         *keyCodePtr = v28->mouseExitEventCode;
                     }
 
-                    if ((v28->flags & BUTTON_FLAG_0x01) && (v28->flags & BUTTON_FLAG_0x020000)) {
-                        _button_draw(v28, v26, v28->pressedImage, 1, NULL, 1);
+                    if ((v28->flags & BUTTON_FLAG_0x01) && (v28->flags & BUTTON_FLAG_CHECKED)) {
+                        _button_draw(v28, v26, v28->pressedImage, true, NULL, true);
                     } else {
-                        _button_draw(v28, v26, v28->normalImage, 1, NULL, 1);
+                        _button_draw(v28, v26, v28->normalImage, true, NULL, true);
                     }
 
                     v26->clickedButton = NULL;
@@ -1857,10 +1853,10 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
 
                             if ((button->flags & BUTTON_FLAG_0x01) != 0) {
                                 if ((button->flags & BUTTON_FLAG_0x02) != 0) {
-                                    if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
+                                    if ((button->flags & BUTTON_FLAG_CHECKED) != 0) {
                                         if (!(button->flags & BUTTON_FLAG_0x04)) {
-                                            if (button->radioGroup != NULL) {
-                                                button->radioGroup->field_4--;
+                                            if (button->buttonGroup != NULL) {
+                                                button->buttonGroup->currChecked--;
                                             }
 
                                             if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_DOWN) != 0) {
@@ -1871,7 +1867,7 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                                                 cb = button->rightMouseUpProc;
                                             }
 
-                                            button->flags &= ~BUTTON_FLAG_0x020000;
+                                            button->flags &= ~BUTTON_FLAG_CHECKED;
                                         }
                                     } else {
                                         if (_button_check_group(button) == -1) {
@@ -1887,7 +1883,7 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                                             cb = button->rightMouseDownProc;
                                         }
 
-                                        button->flags |= BUTTON_FLAG_0x020000;
+                                        button->flags |= BUTTON_FLAG_CHECKED;
                                     }
                                 }
                             } else {
@@ -1905,7 +1901,7 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                                 }
                             }
 
-                            _button_draw(button, window, button->pressedImage, 1, NULL, 1);
+                            _button_draw(button, window, button->pressedImage, true, NULL, true);
                             break;
                         }
 
@@ -1916,10 +1912,10 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
 
                             if (v49->flags & BUTTON_FLAG_0x01) {
                                 if (!(v49->flags & BUTTON_FLAG_0x02)) {
-                                    if (v49->flags & BUTTON_FLAG_0x020000) {
+                                    if (v49->flags & BUTTON_FLAG_CHECKED) {
                                         if (!(v49->flags & BUTTON_FLAG_0x04)) {
-                                            if (v49->radioGroup != NULL) {
-                                                v49->radioGroup->field_4--;
+                                            if (v49->buttonGroup != NULL) {
+                                                v49->buttonGroup->currChecked--;
                                             }
 
                                             if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_UP) != 0) {
@@ -1930,12 +1926,12 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                                                 cb = button->rightMouseUpProc;
                                             }
 
-                                            button->flags &= ~BUTTON_FLAG_0x020000;
+                                            button->flags &= ~BUTTON_FLAG_CHECKED;
                                         }
                                     } else {
                                         if (_button_check_group(v49) == -1) {
                                             button = NULL;
-                                            _button_draw(v49, window, v49->normalImage, 1, NULL, 1);
+                                            _button_draw(v49, window, v49->normalImage, true, NULL, true);
                                             break;
                                         }
 
@@ -1947,13 +1943,13 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                                             cb = v49->rightMouseDownProc;
                                         }
 
-                                        v49->flags |= BUTTON_FLAG_0x020000;
+                                        v49->flags |= BUTTON_FLAG_CHECKED;
                                     }
                                 }
                             } else {
-                                if (v49->flags & BUTTON_FLAG_0x020000) {
-                                    if (v49->radioGroup != NULL) {
-                                        v49->radioGroup->field_4--;
+                                if (v49->flags & BUTTON_FLAG_CHECKED) {
+                                    if (v49->buttonGroup != NULL) {
+                                        v49->buttonGroup->currChecked--;
                                     }
                                 }
 
@@ -1967,9 +1963,9 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                             }
 
                             if (button->hoverImage != NULL) {
-                                _button_draw(button, window, button->hoverImage, 1, NULL, 1);
+                                _button_draw(button, window, button->hoverImage, true, NULL, true);
                             } else {
-                                _button_draw(button, window, button->normalImage, 1, NULL, 1);
+                                _button_draw(button, window, button->normalImage, true, NULL, true);
                             }
                             break;
                         }
@@ -1982,7 +1978,7 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                             cb = button->mouseEnterProc;
                         }
 
-                        _button_draw(button, window, button->hoverImage, 1, NULL, 1);
+                        _button_draw(button, window, button->hoverImage, true, NULL, true);
                     }
                     break;
                 }
@@ -1995,7 +1991,7 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
                 && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_DOWN) != 0
                 && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_REPEAT) == 0) {
                 _win_drag(window->id);
-                _button_draw(button, window, button->normalImage, 1, NULL, 1);
+                _button_draw(button, window, button->normalImage, true, NULL, true);
             }
         } else if ((window->flags & WINDOW_FLAG_0x80) != 0) {
             v25 |= mouseEvent << 8;
@@ -2023,13 +2019,13 @@ int _GNW_check_buttons(Window* window, int* keyCodePtr)
         *keyCodePtr = prevHoveredButton->mouseExitEventCode;
 
         unsigned char* data;
-        if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_0x020000)) {
+        if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_CHECKED)) {
             data = prevHoveredButton->pressedImage;
         } else {
             data = prevHoveredButton->normalImage;
         }
 
-        _button_draw(prevHoveredButton, window, data, 1, NULL, 1);
+        _button_draw(prevHoveredButton, window, data, true, NULL, true);
 
         window->hoveredButton = NULL;
     }
@@ -2142,7 +2138,7 @@ int buttonDestroy(int btn)
 // 0x4D9374
 void buttonFree(Button* button)
 {
-    if ((button->flags & BUTTON_FLAG_0x010000) == 0) {
+    if ((button->flags & BUTTON_FLAG_GRAPHIC) == 0) {
         if (button->normalImage != NULL) {
             internal_free(button->normalImage);
         }
@@ -2168,15 +2164,15 @@ void buttonFree(Button* button)
         }
     }
 
-    RadioGroup* radioGroup = button->radioGroup;
-    if (radioGroup != NULL) {
-        for (int index = 0; index < radioGroup->buttonsLength; index++) {
-            if (button == radioGroup->buttons[index]) {
-                for (; index < radioGroup->buttonsLength - 1; index++) {
-                    radioGroup->buttons[index] = radioGroup->buttons[index + 1];
+    ButtonGroup* buttonGroup = button->buttonGroup;
+    if (buttonGroup != NULL) {
+        for (int index = 0; index < buttonGroup->buttonsLength; index++) {
+            if (button == buttonGroup->buttons[index]) {
+                for (; index < buttonGroup->buttonsLength - 1; index++) {
+                    buttonGroup->buttons[index] = buttonGroup->buttons[index + 1];
                 }
 
-                radioGroup->buttonsLength--;
+                buttonGroup->buttonsLength--;
 
                 break;
             }
@@ -2216,7 +2212,7 @@ int buttonEnable(int btn)
 
     if ((button->flags & BUTTON_FLAG_DISABLED) != 0) {
         button->flags &= ~BUTTON_FLAG_DISABLED;
-        _button_draw(button, window, button->currentImage, 1, NULL, 0);
+        _button_draw(button, window, button->currentImage, true, NULL, false);
     }
 
     return 0;
@@ -2238,7 +2234,7 @@ int buttonDisable(int btn)
     if ((button->flags & BUTTON_FLAG_DISABLED) == 0) {
         button->flags |= BUTTON_FLAG_DISABLED;
 
-        _button_draw(button, window, button->currentImage, 1, NULL, 0);
+        _button_draw(button, window, button->currentImage, true, NULL, false);
 
         if (button == window->hoveredButton) {
             if (window->hoveredButton->mouseExitEventCode != -1) {
@@ -2252,7 +2248,7 @@ int buttonDisable(int btn)
 }
 
 // 0x4D9554
-int _win_set_button_rest_state(int btn, bool a2, int a3)
+int _win_set_button_rest_state(int btn, bool checked, int flags)
 {
     if (!gWindowSystemInitialized) {
         return -1;
@@ -2267,30 +2263,30 @@ int _win_set_button_rest_state(int btn, bool a2, int a3)
     if ((button->flags & BUTTON_FLAG_0x01) != 0) {
         int keyCode = -1;
 
-        if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
-            if (!a2) {
-                button->flags &= ~BUTTON_FLAG_0x020000;
+        if ((button->flags & BUTTON_FLAG_CHECKED) != 0) {
+            if (!checked) {
+                button->flags &= ~BUTTON_FLAG_CHECKED;
 
-                if ((a3 & 0x02) == 0) {
-                    _button_draw(button, window, button->normalImage, 1, NULL, 0);
+                if ((flags & 0x02) == 0) {
+                    _button_draw(button, window, button->normalImage, true, NULL, false);
                 }
 
-                if (button->radioGroup != NULL) {
-                    button->radioGroup->field_4--;
+                if (button->buttonGroup != NULL) {
+                    button->buttonGroup->currChecked--;
                 }
 
                 keyCode = button->leftMouseUpEventCode;
             }
         } else {
-            if (a2) {
-                button->flags |= BUTTON_FLAG_0x020000;
+            if (checked) {
+                button->flags |= BUTTON_FLAG_CHECKED;
 
-                if ((a3 & 0x02) == 0) {
-                    _button_draw(button, window, button->pressedImage, 1, NULL, 0);
+                if ((flags & 0x02) == 0) {
+                    _button_draw(button, window, button->pressedImage, true, NULL, false);
                 }
 
-                if (button->radioGroup != NULL) {
-                    button->radioGroup->field_4++;
+                if (button->buttonGroup != NULL) {
+                    button->buttonGroup->currChecked++;
                 }
 
                 keyCode = button->lefMouseDownEventCode;
@@ -2298,7 +2294,7 @@ int _win_set_button_rest_state(int btn, bool a2, int a3)
         }
 
         if (keyCode != -1) {
-            if ((a3 & 0x01) != 0) {
+            if ((flags & 0x01) != 0) {
                 enqueueInputEvent(keyCode);
             }
         }
@@ -2308,20 +2304,20 @@ int _win_set_button_rest_state(int btn, bool a2, int a3)
 }
 
 // 0x4D962C
-int _win_group_check_buttons(int buttonCount, int* btns, int a3, void (*a4)(int))
+int _win_group_check_buttons(int buttonCount, int* btns, int maxChecked, RadioButtonCallback* func)
 {
     if (!gWindowSystemInitialized) {
         return -1;
     }
 
-    if (buttonCount >= RADIO_GROUP_BUTTON_LIST_CAPACITY) {
+    if (buttonCount >= BUTTON_GROUP_BUTTON_LIST_CAPACITY) {
         return -1;
     }
 
-    for (int groupIndex = 0; groupIndex < RADIO_GROUP_LIST_CAPACITY; groupIndex++) {
-        RadioGroup* radioGroup = &(gRadioGroups[groupIndex]);
-        if (radioGroup->buttonsLength == 0) {
-            radioGroup->field_4 = 0;
+    for (int groupIndex = 0; groupIndex < BUTTON_GROUP_LIST_CAPACITY; groupIndex++) {
+        ButtonGroup* buttonGroup = &(gButtonGroups[groupIndex]);
+        if (buttonGroup->buttonsLength == 0) {
+            buttonGroup->currChecked = 0;
 
             for (int buttonIndex = 0; buttonIndex < buttonCount; buttonIndex++) {
                 Button* button = buttonGetButton(btns[buttonIndex], NULL);
@@ -2329,18 +2325,18 @@ int _win_group_check_buttons(int buttonCount, int* btns, int a3, void (*a4)(int)
                     return -1;
                 }
 
-                radioGroup->buttons[buttonIndex] = button;
+                buttonGroup->buttons[buttonIndex] = button;
 
-                button->radioGroup = radioGroup;
+                button->buttonGroup = buttonGroup;
 
-                if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
-                    radioGroup->field_4++;
+                if ((button->flags & BUTTON_FLAG_CHECKED) != 0) {
+                    buttonGroup->currChecked++;
                 }
             }
 
-            radioGroup->buttonsLength = buttonCount;
-            radioGroup->field_0 = a3;
-            radioGroup->field_8 = a4;
+            buttonGroup->buttonsLength = buttonCount;
+            buttonGroup->maxChecked = maxChecked;
+            buttonGroup->func = func;
             return 0;
         }
     }
@@ -2360,11 +2356,11 @@ int _win_group_radio_buttons(int count, int* btns)
     }
 
     Button* button = buttonGetButton(btns[0], NULL);
-    RadioGroup* radioGroup = button->radioGroup;
+    ButtonGroup* buttonGroup = button->buttonGroup;
 
-    for (int index = 0; index < radioGroup->buttonsLength; index++) {
-        Button* v1 = radioGroup->buttons[index];
-        v1->flags |= BUTTON_FLAG_0x040000;
+    for (int index = 0; index < buttonGroup->buttonsLength; index++) {
+        Button* v1 = buttonGroup->buttons[index];
+        v1->flags |= BUTTON_FLAG_RADIO;
     }
 
     return 0;
@@ -2373,20 +2369,20 @@ int _win_group_radio_buttons(int count, int* btns)
 // 0x4D9744
 int _button_check_group(Button* button)
 {
-    if (button->radioGroup == NULL) {
+    if (button->buttonGroup == NULL) {
         return 0;
     }
 
-    if ((button->flags & BUTTON_FLAG_0x040000) != 0) {
-        if (button->radioGroup->field_4 > 0) {
-            for (int index = 0; index < button->radioGroup->buttonsLength; index++) {
-                Button* v1 = button->radioGroup->buttons[index];
-                if ((v1->flags & BUTTON_FLAG_0x020000) != 0) {
-                    v1->flags &= ~BUTTON_FLAG_0x020000;
+    if ((button->flags & BUTTON_FLAG_RADIO) != 0) {
+        if (button->buttonGroup->currChecked > 0) {
+            for (int index = 0; index < button->buttonGroup->buttonsLength; index++) {
+                Button* v1 = button->buttonGroup->buttons[index];
+                if ((v1->flags & BUTTON_FLAG_CHECKED) != 0) {
+                    v1->flags &= ~BUTTON_FLAG_CHECKED;
 
                     Window* window;
                     buttonGetButton(v1->id, &window);
-                    _button_draw(v1, window, v1->normalImage, 1, NULL, 1);
+                    _button_draw(v1, window, v1->normalImage, true, NULL, true);
 
                     if (v1->leftMouseUpProc != NULL) {
                         v1->leftMouseUpProc(v1->id, v1->leftMouseUpEventCode);
@@ -2395,30 +2391,30 @@ int _button_check_group(Button* button)
             }
         }
 
-        if ((button->flags & BUTTON_FLAG_0x020000) == 0) {
-            button->radioGroup->field_4++;
+        if ((button->flags & BUTTON_FLAG_CHECKED) == 0) {
+            button->buttonGroup->currChecked++;
         }
 
         return 0;
     }
 
-    if (button->radioGroup->field_4 < button->radioGroup->field_0) {
-        if ((button->flags & BUTTON_FLAG_0x020000) == 0) {
-            button->radioGroup->field_4++;
+    if (button->buttonGroup->currChecked < button->buttonGroup->maxChecked) {
+        if ((button->flags & BUTTON_FLAG_CHECKED) == 0) {
+            button->buttonGroup->currChecked++;
         }
 
         return 0;
     }
 
-    if (button->radioGroup->field_8 != NULL) {
-        button->radioGroup->field_8(button->id);
+    if (button->buttonGroup->func != NULL) {
+        button->buttonGroup->func(button->id);
     }
 
     return -1;
 }
 
 // 0x4D9808
-void _button_draw(Button* button, Window* window, unsigned char* data, int a4, Rect* a5, int a6)
+void _button_draw(Button* button, Window* window, unsigned char* data, bool draw, Rect* bound, bool sound)
 {
     unsigned char* previousImage = NULL;
     if (data != NULL) {
@@ -2427,8 +2423,8 @@ void _button_draw(Button* button, Window* window, unsigned char* data, int a4, R
         rectOffset(&v2, window->rect.left, window->rect.top);
 
         Rect v3;
-        if (a5 != NULL) {
-            if (rectIntersection(&v2, a5, &v2) == -1) {
+        if (bound != NULL) {
+            if (rectIntersection(&v2, bound, &v2) == -1) {
                 return;
             }
 
@@ -2438,7 +2434,7 @@ void _button_draw(Button* button, Window* window, unsigned char* data, int a4, R
             rectCopy(&v3, &(button->rect));
         }
 
-        if (data == button->normalImage && (button->flags & BUTTON_FLAG_0x020000)) {
+        if (data == button->normalImage && (button->flags & BUTTON_FLAG_CHECKED)) {
             data = button->pressedImage;
         }
 
@@ -2461,7 +2457,7 @@ void _button_draw(Button* button, Window* window, unsigned char* data, int a4, R
         }
 
         if (data) {
-            if (a4 == 0) {
+            if (!draw) {
                 int width = button->rect.right - button->rect.left + 1;
                 if ((button->flags & BUTTON_FLAG_TRANSPARENT) != 0) {
                     blitBufferToBufferTrans(
@@ -2485,18 +2481,18 @@ void _button_draw(Button* button, Window* window, unsigned char* data, int a4, R
             previousImage = button->currentImage;
             button->currentImage = data;
 
-            if (a4 != 0) {
+            if (draw) {
                 _GNW_win_refresh(window, &v2, 0);
             }
         }
     }
 
-    if (a6) {
+    if (sound) {
         if (previousImage != data) {
-            if (data == button->pressedImage && button->onPressed != NULL) {
-                button->onPressed(button->id, button->lefMouseDownEventCode);
-            } else if (data == button->normalImage && button->onUnpressed != NULL) {
-                button->onUnpressed(button->id, button->leftMouseUpEventCode);
+            if (data == button->pressedImage && button->pressSoundFunc != NULL) {
+                button->pressSoundFunc(button->id, button->lefMouseDownEventCode);
+            } else if (data == button->normalImage && button->releaseSoundFunc != NULL) {
+                button->releaseSoundFunc(button->id, button->leftMouseUpEventCode);
             }
         }
     }
@@ -2513,7 +2509,7 @@ void _GNW_button_refresh(Window* window, Rect* rect)
     }
 
     while (button != NULL) {
-        _button_draw(button, window, button->currentImage, 0, rect, 0);
+        _button_draw(button, window, button->currentImage, false, rect, false);
         button = button->prev;
     }
 }
@@ -2531,7 +2527,7 @@ int _win_button_press_and_release(int btn)
         return -1;
     }
 
-    _button_draw(button, window, button->pressedImage, 1, NULL, 1);
+    _button_draw(button, window, button->pressedImage, true, NULL, true);
 
     if (button->leftMouseDownProc != NULL) {
         button->leftMouseDownProc(btn, button->lefMouseDownEventCode);
@@ -2545,7 +2541,7 @@ int _win_button_press_and_release(int btn)
         }
     }
 
-    _button_draw(button, window, button->normalImage, 1, NULL, 1);
+    _button_draw(button, window, button->normalImage, true, NULL, true);
 
     if (button->leftMouseUpProc != NULL) {
         button->leftMouseUpProc(btn, button->leftMouseUpEventCode);
diff --git a/src/window_manager.h b/src/window_manager.h
index 2275b4d..265aa7e 100644
--- a/src/window_manager.h
+++ b/src/window_manager.h
@@ -8,7 +8,7 @@
 namespace fallout {
 
 // The maximum number of buttons in one radio group.
-#define RADIO_GROUP_BUTTON_LIST_CAPACITY (64)
+#define BUTTON_GROUP_BUTTON_LIST_CAPACITY (64)
 
 typedef enum WindowManagerErr {
     WINDOW_MANAGER_OK = 0,
@@ -55,9 +55,9 @@ typedef enum ButtonFlags {
     BUTTON_FLAG_0x10 = 0x10,
     BUTTON_FLAG_TRANSPARENT = 0x20,
     BUTTON_FLAG_0x40 = 0x40,
-    BUTTON_FLAG_0x010000 = 0x010000,
-    BUTTON_FLAG_0x020000 = 0x020000,
-    BUTTON_FLAG_0x040000 = 0x040000,
+    BUTTON_FLAG_GRAPHIC = 0x010000,
+    BUTTON_FLAG_CHECKED = 0x020000,
+    BUTTON_FLAG_RADIO = 0x040000,
     BUTTON_FLAG_RIGHT_MOUSE_BUTTON_CONFIGURED = 0x080000,
 } ButtonFlags;
 
@@ -66,8 +66,8 @@ typedef struct MenuPulldown {
     int keyCode;
     int itemsLength;
     char** items;
-    int field_1C;
-    int field_20;
+    int foregroundColor;
+    int backgroundColor;
 } MenuPulldown;
 
 typedef struct MenuBar {
@@ -75,14 +75,14 @@ typedef struct MenuBar {
     Rect rect;
     int pulldownsLength;
     MenuPulldown pulldowns[15];
-    int borderColor;
+    int foregroundColor;
     int backgroundColor;
 } MenuBar;
 
 typedef void WindowBlitProc(unsigned char* src, int width, int height, int srcPitch, unsigned char* dest, int destPitch);
 
 typedef struct Button Button;
-typedef struct RadioGroup RadioGroup;
+typedef struct ButtonGroup ButtonGroup;
 
 typedef struct Window {
     int id;
@@ -102,6 +102,7 @@ typedef struct Window {
 } Window;
 
 typedef void ButtonCallback(int btn, int keyCode);
+typedef void RadioButtonCallback(int btn);
 
 typedef struct Button {
     int id;
@@ -127,20 +128,20 @@ typedef struct Button {
     ButtonCallback* leftMouseUpProc;
     ButtonCallback* rightMouseDownProc;
     ButtonCallback* rightMouseUpProc;
-    ButtonCallback* onPressed;
-    ButtonCallback* onUnpressed;
-    RadioGroup* radioGroup;
+    ButtonCallback* pressSoundFunc;
+    ButtonCallback* releaseSoundFunc;
+    ButtonGroup* buttonGroup;
     Button* prev;
     Button* next;
 } Button;
 
-typedef struct RadioGroup {
-    int field_0;
-    int field_4;
-    void (*field_8)(int);
+typedef struct ButtonGroup {
+    int maxChecked;
+    int currChecked;
+    RadioButtonCallback* func;
     int buttonsLength;
-    Button* buttons[RADIO_GROUP_BUTTON_LIST_CAPACITY];
-} RadioGroup;
+    Button* buttons[BUTTON_GROUP_BUTTON_LIST_CAPACITY];
+} ButtonGroup;
 
 typedef int(VideoSystemInitProc)();
 typedef void(VideoSystemExitProc)();
@@ -157,7 +158,7 @@ void windowDrawText(int win, const char* str, int a3, int x, int y, int a6);
 void _win_text(int win, char** fileNameList, int fileNameListLength, int maxWidth, int x, int y, int flags);
 void windowDrawLine(int win, int left, int top, int right, int bottom, int color);
 void windowDrawRect(int win, int left, int top, int right, int bottom, int color);
-void windowFill(int win, int x, int y, int width, int height, int a6);
+void windowFill(int win, int x, int y, int width, int height, int color);
 void windowShow(int win);
 void windowHide(int win);
 void windowRefresh(int win);
@@ -178,10 +179,10 @@ bool showMesageBox(const char* str);
 int buttonCreate(int win, int x, int y, int width, int height, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, unsigned char* up, unsigned char* dn, unsigned char* hover, int flags);
 int _win_register_text_button(int win, int x, int y, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, const char* title, int flags);
 int _win_register_button_disable(int btn, unsigned char* up, unsigned char* down, unsigned char* hover);
-int _win_register_button_image(int btn, unsigned char* up, unsigned char* down, unsigned char* hover, int a5);
+int _win_register_button_image(int btn, unsigned char* up, unsigned char* down, unsigned char* hover, bool draw);
 int buttonSetMouseCallbacks(int btn, ButtonCallback* mouseEnterProc, ButtonCallback* mouseExitProc, ButtonCallback* mouseDownProc, ButtonCallback* mouseUpProc);
 int buttonSetRightMouseCallbacks(int btn, int rightMouseDownEventCode, int rightMouseUpEventCode, ButtonCallback* rightMouseDownProc, ButtonCallback* rightMouseUpProc);
-int buttonSetCallbacks(int btn, ButtonCallback* onPressed, ButtonCallback* onUnpressed);
+int buttonSetCallbacks(int btn, ButtonCallback* pressSoundFunc, ButtonCallback* releaseSoundFunc);
 int buttonSetMask(int btn, unsigned char* mask);
 bool _win_button_down(int btn);
 int buttonGetWindowId(int btn);
@@ -189,8 +190,8 @@ int _win_last_button_winID();
 int buttonDestroy(int btn);
 int buttonEnable(int btn);
 int buttonDisable(int btn);
-int _win_set_button_rest_state(int btn, bool a2, int a3);
-int _win_group_radio_buttons(int a1, int* a2);
+int _win_set_button_rest_state(int btn, bool checked, int flags);
+int _win_group_radio_buttons(int buttonCount, int* btns);
 int _win_button_press_and_release(int btn);
 
 } // namespace fallout
diff --git a/src/window_manager_private.cc b/src/window_manager_private.cc
index 88fe9d2..af94de7 100644
--- a/src/window_manager_private.cc
+++ b/src/window_manager_private.cc
@@ -79,13 +79,13 @@ static int _currx;
 char gProgramWindowTitle[256];
 
 // 0x4DA6C0
-int _win_list_select(const char* title, char** fileList, int fileListLength, ListSelectionHandler* callback, int x, int y, int a7)
+int _win_list_select(const char* title, char** fileList, int fileListLength, ListSelectionHandler* callback, int x, int y, int color)
 {
-    return _win_list_select_at(title, fileList, fileListLength, callback, x, y, a7, 0);
+    return _win_list_select_at(title, fileList, fileListLength, callback, x, y, color, 0);
 }
 
 // 0x4DA70C
-int _win_list_select_at(const char* title, char** items, int itemsLength, ListSelectionHandler* callback, int x, int y, int a7, int a8)
+int _win_list_select_at(const char* title, char** items, int itemsLength, ListSelectionHandler* callback, int x, int y, int color, int start)
 {
     if (!gWindowSystemInitialized) {
         return -1;
@@ -170,8 +170,8 @@ int _win_list_select_at(const char* title, char** items, int itemsLength, ListSe
         windowWidth,
         _colorTable[_GNW_wcolor[0]]);
 
-    int scrollOffset = a8;
-    if (a8 < 0 || a8 >= itemsLength) {
+    int scrollOffset = start;
+    if (start < 0 || start >= itemsLength) {
         scrollOffset = 0;
     }
 
@@ -189,14 +189,13 @@ int _win_list_select_at(const char* title, char** items, int itemsLength, ListSe
         selectedItemIndex = 0;
     }
 
-    char** itemsTO = items + a8;
     _win_text(win,
-        items + a8,
+        items + start,
         itemsLength < listViewCapacity ? itemsLength : listViewCapacity,
         listViewWidth,
         listViewX,
         listViewY,
-        a7 | 0x2000000);
+        color | 0x2000000);
 
     _lighten_buf(listViewBuffer + windowWidth * selectedItemIndex * fontGetLineHeight(),
         listViewWidth,
@@ -452,7 +451,7 @@ int _win_list_select_at(const char* title, char** items, int itemsLength, ListSe
                 listViewWidth,
                 listViewX,
                 listViewY,
-                a7 | 0x2000000);
+                color | 0x2000000);
 
             _lighten_buf(listViewBuffer + windowWidth * selectedItemIndex * fontGetLineHeight(),
                 listViewWidth,
@@ -500,19 +499,19 @@ int _win_list_select_at(const char* title, char** items, int itemsLength, ListSe
                     windowWidth,
                     _colorTable[_GNW_wcolor[0]]);
 
-                int color;
-                if ((a7 & 0xFF00) != 0) {
-                    int colorIndex = (a7 & 0xFF) - 1;
-                    color = (a7 & ~0xFFFF) | _colorTable[_GNW_wcolor[colorIndex]];
+                int textColor;
+                if ((color & 0xFF00) != 0) {
+                    int colorIndex = (color & 0xFF) - 1;
+                    textColor = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[colorIndex]];
                 } else {
-                    color = a7;
+                    textColor = color;
                 }
 
                 fontDrawText(listViewBuffer + windowWidth * previousSelectedItemIndex * fontGetLineHeight(),
                     items[scrollOffset + previousSelectedItemIndex],
                     windowWidth,
                     windowWidth,
-                    color);
+                    textColor);
 
                 _GNW_win_refresh(window, &itemRect, NULL);
             }
@@ -619,7 +618,7 @@ int _win_get_str(char* dest, int length, const char* title, int x, int y)
 }
 
 // 0x4DBA98
-int _win_msg(const char* string, int x, int y, int flags)
+int _win_msg(const char* string, int x, int y, int color)
 {
     if (!gWindowSystemInitialized) {
         return -1;
@@ -644,16 +643,16 @@ int _win_msg(const char* string, int x, int y, int flags)
     Window* window = windowGetWindow(win);
     unsigned char* windowBuffer = window->buffer;
 
-    int color;
-    if ((flags & 0xFF00) != 0) {
-        int index = (flags & 0xFF) - 1;
-        color = _colorTable[_GNW_wcolor[index]];
-        color |= flags & ~0xFFFF;
+    int textColor;
+    if ((color & 0xFF00) != 0) {
+        int index = (color & 0xFF) - 1;
+        textColor = _colorTable[_GNW_wcolor[index]];
+        textColor |= color & ~0xFFFF;
     } else {
-        color = flags;
+        textColor = color;
     }
 
-    fontDrawText(windowBuffer + windowWidth * 8 + 16, string, windowWidth, windowWidth, color);
+    fontDrawText(windowBuffer + windowWidth * 8 + 16, string, windowWidth, windowWidth, textColor);
 
     _win_register_text_button(win,
         windowWidth / 2 - 32,
@@ -679,23 +678,23 @@ int _win_msg(const char* string, int x, int y, int flags)
 }
 
 // 0x4DBBC4
-int _win_pull_down(char** items, int itemsLength, int x, int y, int a5)
+int _win_pull_down(char** items, int itemsLength, int x, int y, int color)
 {
     if (!gWindowSystemInitialized) {
         return -1;
     }
 
     Rect rect;
-    int win = _create_pull_down(items, itemsLength, x, y, a5, _colorTable[_GNW_wcolor[0]], &rect);
+    int win = _create_pull_down(items, itemsLength, x, y, color, _colorTable[_GNW_wcolor[0]], &rect);
     if (win == -1) {
         return -1;
     }
 
-    return sub_4DBD04(win, &rect, items, itemsLength, a5, _colorTable[_GNW_wcolor[0]], NULL, -1);
+    return process_pull_down(win, &rect, items, itemsLength, color, _colorTable[_GNW_wcolor[0]], NULL, -1);
 }
 
 // 0x4DBC34
-int _create_pull_down(char** stringList, int stringListLength, int x, int y, int a5, int a6, Rect* rect)
+int _create_pull_down(char** stringList, int stringListLength, int x, int y, int foregroundColor, int backgroundColor, Rect* rect)
 {
     int windowHeight = stringListLength * fontGetLineHeight() + 16;
     int windowWidth = _win_width_needed(stringList, stringListLength) + 4;
@@ -703,14 +702,14 @@ int _create_pull_down(char** stringList, int stringListLength, int x, int y, int
         return -1;
     }
 
-    int win = windowCreate(x, y, windowWidth, windowHeight, a6, WINDOW_MODAL | WINDOW_MOVE_ON_TOP);
+    int win = windowCreate(x, y, windowWidth, windowHeight, backgroundColor, WINDOW_MODAL | WINDOW_MOVE_ON_TOP);
     if (win == -1) {
         return -1;
     }
 
-    _win_text(win, stringList, stringListLength, windowWidth - 4, 2, 8, a5);
+    _win_text(win, stringList, stringListLength, windowWidth - 4, 2, 8, foregroundColor);
     windowDrawRect(win, 0, 0, windowWidth - 1, windowHeight - 1, _colorTable[0]);
-    windowDrawRect(win, 1, 1, windowWidth - 2, windowHeight - 2, a5);
+    windowDrawRect(win, 1, 1, windowWidth - 2, windowHeight - 2, foregroundColor);
     windowRefresh(win);
     windowGetRect(win, rect);
 
@@ -841,7 +840,7 @@ void _win_debug_delete(int btn, int keyCode)
 }
 
 // 0x4DC674
-int _win_register_menu_bar(int win, int x, int y, int width, int height, int borderColor, int backgroundColor)
+int _win_register_menu_bar(int win, int x, int y, int width, int height, int foregroundColor, int backgroundColor)
 {
     Window* window = windowGetWindow(win);
 
@@ -878,17 +877,17 @@ int _win_register_menu_bar(int win, int x, int y, int width, int height, int bor
     menuBar->rect.right = right - 1;
     menuBar->rect.bottom = bottom - 1;
     menuBar->pulldownsLength = 0;
-    menuBar->borderColor = borderColor;
+    menuBar->foregroundColor = foregroundColor;
     menuBar->backgroundColor = backgroundColor;
 
     windowFill(win, x, y, width, height, backgroundColor);
-    windowDrawRect(win, x, y, right - 1, bottom - 1, borderColor);
+    windowDrawRect(win, x, y, right - 1, bottom - 1, foregroundColor);
 
     return 0;
 }
 
 // 0x4DC768
-int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int itemsLength, char** items, int a7, int a8)
+int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int itemsLength, char** items, int foregroundColor, int backgroundColor)
 {
     Window* window = windowGetWindow(win);
 
@@ -928,7 +927,7 @@ int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int it
         return -1;
     }
 
-    windowDrawText(win, title, 0, titleX, titleY, window->menuBar->borderColor | 0x2000000);
+    windowDrawText(win, title, 0, titleX, titleY, window->menuBar->foregroundColor | 0x2000000);
 
     MenuPulldown* pulldown = &(window->menuBar->pulldowns[window->menuBar->pulldownsLength]);
     pulldown->rect.left = titleX;
@@ -938,8 +937,8 @@ int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int it
     pulldown->keyCode = keyCode;
     pulldown->itemsLength = itemsLength;
     pulldown->items = items;
-    pulldown->field_1C = a7;
-    pulldown->field_20 = a8;
+    pulldown->foregroundColor = foregroundColor;
+    pulldown->backgroundColor = backgroundColor;
 
     window->menuBar->pulldownsLength++;
 
@@ -1120,7 +1119,7 @@ int _win_input_str(int win, char* dest, int maxLength, int x, int y, int textCol
 }
 
 // 0x4DBD04
-int sub_4DBD04(int win, Rect* rect, char** items, int itemsLength, int a5, int a6, MenuBar* menuBar, int pulldownIndex)
+int process_pull_down(int win, Rect* rect, char** items, int itemsLength, int foregroundColor, int backgroundColor, MenuBar* menuBar, int pulldownIndex)
 {
     // TODO: Incomplete.
     return -1;
@@ -1143,15 +1142,15 @@ int _GNW_process_menu(MenuBar* menuBar, int pulldownIndex)
             pulldown->itemsLength,
             pulldown->rect.left,
             menuBar->rect.bottom + 1,
-            pulldown->field_1C,
-            pulldown->field_20,
+            pulldown->foregroundColor,
+            pulldown->backgroundColor,
             &rect);
         if (win == -1) {
             _curr_menu = NULL;
             return -1;
         }
 
-        keyCode = sub_4DBD04(win, &rect, pulldown->items, pulldown->itemsLength, pulldown->field_1C, pulldown->field_20, menuBar, pulldownIndex);
+        keyCode = process_pull_down(win, &rect, pulldown->items, pulldown->itemsLength, pulldown->foregroundColor, pulldown->backgroundColor, menuBar, pulldownIndex);
         if (keyCode < -1) {
             pulldownIndex = -2 - keyCode;
         }
@@ -1168,20 +1167,20 @@ int _GNW_process_menu(MenuBar* menuBar, int pulldownIndex)
     return keyCode;
 }
 
-// Calculates max length of string needed to represent a1 or a2.
+// Calculates max length of string needed to represent `value` or `value2`.
 //
 // 0x4DD03C
-size_t _calc_max_field_chars_wcursor(int a1, int a2)
+size_t _calc_max_field_chars_wcursor(int value1, int value2)
 {
     char* str = (char*)internal_malloc(17);
     if (str == NULL) {
         return -1;
     }
 
-    snprintf(str, 17, "%d", a1);
+    snprintf(str, 17, "%d", value1);
     size_t len1 = strlen(str);
 
-    snprintf(str, 17, "%d", a2);
+    snprintf(str, 17, "%d", value2);
     size_t len2 = strlen(str);
 
     internal_free(str);
@@ -1272,7 +1271,7 @@ void _tm_kill_msg()
 }
 
 // 0x4DD744
-void _tm_kill_out_of_order(int a1)
+void _tm_kill_out_of_order(int queueIndex)
 {
     int v7;
     int v6;
@@ -1281,16 +1280,16 @@ void _tm_kill_out_of_order(int a1)
         return;
     }
 
-    if (!_tm_index_active(a1)) {
+    if (!_tm_index_active(queueIndex)) {
         return;
     }
 
-    windowDestroy(_tm_queue[a1].field_4);
+    windowDestroy(_tm_queue[queueIndex].field_4);
 
-    _tm_location[_tm_queue[a1].field_8].field_0 = 0;
+    _tm_location[_tm_queue[queueIndex].field_8].field_0 = 0;
 
-    if (a1 != _tm_kill) {
-        v6 = a1;
+    if (queueIndex != _tm_kill) {
+        v6 = queueIndex;
         do {
             v7 = v6 - 1;
             if (v7 < 0) {
@@ -1317,35 +1316,35 @@ void _tm_kill_out_of_order(int a1)
 void _tm_click_response(int btn)
 {
     int win;
-    int v3;
+    int queueIndex;
 
     if (_tm_kill == -1) {
         return;
     }
 
     win = buttonGetWindowId(btn);
-    v3 = _tm_kill;
-    while (win != _tm_queue[v3].field_4) {
-        v3++;
-        if (v3 == 5) {
-            v3 = 0;
+    queueIndex = _tm_kill;
+    while (win != _tm_queue[queueIndex].field_4) {
+        queueIndex++;
+        if (queueIndex == 5) {
+            queueIndex = 0;
         }
 
-        if (v3 == _tm_kill || !_tm_index_active(v3))
+        if (queueIndex == _tm_kill || !_tm_index_active(queueIndex))
             return;
     }
 
-    _tm_kill_out_of_order(v3);
+    _tm_kill_out_of_order(queueIndex);
 }
 
 // 0x4DD870
-int _tm_index_active(int a1)
+int _tm_index_active(int queueIndex)
 {
     if (_tm_kill != _tm_add) {
         if (_tm_kill >= _tm_add) {
-            if (a1 >= _tm_add && a1 < _tm_kill)
+            if (queueIndex >= _tm_add && queueIndex < _tm_kill)
                 return 0;
-        } else if (a1 < _tm_kill || a1 >= _tm_add) {
+        } else if (queueIndex < _tm_kill || queueIndex >= _tm_add) {
             return 0;
         }
     }
diff --git a/src/window_manager_private.h b/src/window_manager_private.h
index abbc4e8..449a2ed 100644
--- a/src/window_manager_private.h
+++ b/src/window_manager_private.h
@@ -13,30 +13,30 @@ typedef void(ListSelectionHandler)(char** items, int index);
 
 extern char gProgramWindowTitle[256];
 
-int _win_list_select(const char* title, char** fileList, int fileListLength, ListSelectionHandler* callback, int x, int y, int a7);
-int _win_list_select_at(const char* title, char** items, int itemsLength, ListSelectionHandler* callback, int x, int y, int a7, int a8);
+int _win_list_select(const char* title, char** fileList, int fileListLength, ListSelectionHandler* callback, int x, int y, int color);
+int _win_list_select_at(const char* title, char** items, int itemsLength, ListSelectionHandler* callback, int x, int y, int color, int start);
 int _win_get_str(char* dest, int length, const char* title, int x, int y);
-int _win_msg(const char* string, int x, int y, int flags);
-int _win_pull_down(char** items, int itemsLength, int x, int y, int a5);
-int _create_pull_down(char** stringList, int stringListLength, int x, int y, int a5, int a6, Rect* rect);
+int _win_msg(const char* string, int x, int y, int color);
+int _win_pull_down(char** items, int itemsLength, int x, int y, int color);
+int _create_pull_down(char** stringList, int stringListLength, int x, int y, int foregroundColor, int backgroundColor, Rect* rect);
 int _win_debug(char* string);
 void _win_debug_delete(int btn, int keyCode);
-int _win_register_menu_bar(int win, int x, int y, int width, int height, int borderColor, int backgroundColor);
-int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int itemsLength, char** items, int a7, int a8);
+int _win_register_menu_bar(int win, int x, int y, int width, int height, int foregroundColor, int backgroundColor);
+int _win_register_menu_pulldown(int win, int x, char* title, int keyCode, int itemsLength, char** items, int foregroundColor, int backgroundColor);
 void _win_delete_menu_bar(int win);
 int _find_first_letter(int ch, char** stringList, int stringListLength);
 int _win_width_needed(char** fileNameList, int fileNameListLength);
 int _win_input_str(int win, char* dest, int maxLength, int x, int y, int textColor, int backgroundColor);
-int sub_4DBD04(int win, Rect* rect, char** items, int itemsLength, int a5, int a6, MenuBar* menuBar, int pulldownIndex);
+int process_pull_down(int win, Rect* rect, char** items, int itemsLength, int a5, int a6, MenuBar* menuBar, int pulldownIndex);
 int _GNW_process_menu(MenuBar* menuBar, int pulldownIndex);
-size_t _calc_max_field_chars_wcursor(int a1, int a2);
+size_t _calc_max_field_chars_wcursor(int value1, int value2);
 void _GNW_intr_init();
 void _GNW_intr_exit();
 void _tm_watch_msgs();
 void _tm_kill_msg();
-void _tm_kill_out_of_order(int a1);
+void _tm_kill_out_of_order(int queueIndex);
 void _tm_click_response(int btn);
-int _tm_index_active(int a1);
+int _tm_index_active(int queueIndex);
 
 } // namespace fallout
 
diff --git a/src/worldmap.cc b/src/worldmap.cc
index a02914f..9b6ff3d 100644
--- a/src/worldmap.cc
+++ b/src/worldmap.cc
@@ -6592,4 +6592,15 @@ void wmBlinkRndEncounterIcon(bool special)
     wmGenData.encounterIconIsVisible = false;
 }
 
+void wmSetPartyWorldPos(int x, int y)
+{
+    wmGenData.worldPosX = x;
+    wmGenData.worldPosY = y;
+}
+
+void wmCarSetCurrentArea(int area)
+{
+    wmGenData.currentCarAreaId = area;
+}
+
 } // namespace fallout
diff --git a/src/worldmap.h b/src/worldmap.h
index 1180d70..901b0a6 100644
--- a/src/worldmap.h
+++ b/src/worldmap.h
@@ -277,6 +277,9 @@ int wmSetMapMusic(int mapIdx, const char* name);
 int wmMatchAreaContainingMapIdx(int mapIdx, int* areaIdxPtr);
 int wmTeleportToArea(int areaIdx);
 
+void wmSetPartyWorldPos(int x, int y);
+void wmCarSetCurrentArea(int area);
+
 } // namespace fallout
 
 #endif /* WORLD_MAP_H */
diff --git a/src/xfile.cc b/src/xfile.cc
index f2ce72c..60bcea2 100644
--- a/src/xfile.cc
+++ b/src/xfile.cc
@@ -234,10 +234,10 @@ char* xfileReadString(char* string, int size, XFile* stream)
         result = dfileReadString(string, size, stream->dfile);
         break;
     case XFILE_TYPE_GZFILE:
-        result = gzgets(stream->gzfile, string, size);
+        result = compat_gzgets(stream->gzfile, string, size);
         break;
     default:
-        result = fgets(string, size, stream->file);
+        result = compat_fgets(string, size, stream->file);
         break;
     }