diff --git a/asm/code_08050038.s b/asm/code_08050038.s
index 6f789d02..9e01870f 100644
--- a/asm/code_08050038.s
+++ b/asm/code_08050038.s
@@ -5,8 +5,8 @@
 
 	.text
 
-	thumb_func_start sub_08050154
-sub_08050154: @ 0x08050154
+	thumb_func_start UpdateFade
+UpdateFade: @ 0x08050154
 	push {r4, r5, r6, lr}
 	ldr r4, _08050180 @ =gFadeControl
 	ldrh r0, [r4, #8]
diff --git a/asm/macros/scripts.inc b/asm/macros/scripts.inc
index 240d481d..c165f8fe 100644
--- a/asm/macros/scripts.inc
+++ b/asm/macros/scripts.inc
@@ -329,7 +329,7 @@
 	.2byte \s
 .endm
 
-.macro _0807E788 w:req
+.macro SetFadeMask w:req
 	.2byte 0x0c39
 	.4byte \w
 .endm
diff --git a/data/scripts/script_0801232C.inc b/data/scripts/script_0801232C.inc
index cca78f35..543e73ed 100644
--- a/data/scripts/script_0801232C.inc
+++ b/data/scripts/script_0801232C.inc
@@ -31,7 +31,7 @@ script_08012368:
 	StopBgm
 	BeginBlock 
 	_0807E778 0x0004
-	_0807E788 0x00007fff
+	SetFadeMask 0x00007fff
 	DoFade5 
 	_0807E858 0x0080
 	EndBlock 
@@ -55,7 +55,7 @@ script_08012368:
 	Wait 0x003c
 	BeginBlock 
 	_0807E778 0x0004
-	_0807E788 0xffffffff
+	SetFadeMask 0xffffffff
 	DoFade4 
 	_0807E858 0x0080
 	EndBlock 
diff --git a/data/scripts/script_08012430.inc b/data/scripts/script_08012430.inc
index c18f6787..fbc1bae5 100644
--- a/data/scripts/script_08012430.inc
+++ b/data/scripts/script_08012430.inc
@@ -77,7 +77,7 @@ script_0801248A:
 	MoveEntityToPlayer 
 	Call sub_0807F844
 	CameraTargetPlayer 
-	_0807E788 0xffffffff
+	SetFadeMask 0xffffffff
 	_0807E778 0x0004
 	_0807E800 0x00000000
 	WaitFor_2 
diff --git a/data/scripts/script_0801319A.inc b/data/scripts/script_0801319A.inc
index 4e7727b2..d3bac5c5 100644
--- a/data/scripts/script_0801319A.inc
+++ b/data/scripts/script_0801319A.inc
@@ -49,7 +49,7 @@ SCRIPT_START script_080131AC
 	_0807EA94 
 	_0807E5F8 0x00000020
 	WaitForSomething2 0x00000040
-	_0807E788 0xffff7fff
+	SetFadeMask 0xffff7fff
 	_0807E778 0x0004
 	DoFade5 
 	WaitFor_2 
@@ -60,7 +60,7 @@ SCRIPT_START script_080131AC
 	Call sub_0807F5C0
 	TextboxNoOverlapFollowPos 0x1604, 0x0007
 	_0807EA94 
-	_0807E788 0xffffffff
+	SetFadeMask 0xffffffff
 	_0807E778 0x0004
 	DoFade4 
 	WaitFor_2 
diff --git a/data/scripts/script_08016384.inc b/data/scripts/script_08016384.inc
index 7887a419..cb512c2e 100644
--- a/data/scripts/script_08016384.inc
+++ b/data/scripts/script_08016384.inc
@@ -62,4 +62,4 @@ SCRIPT_START script_08016384
 	WaitFor_1 
 	WaitFor_2 
 	_0807E778 0x0004
-	_0807E788 0x0000ffff
+	SetFadeMask 0x0000ffff
diff --git a/include/main.h b/include/main.h
index 679fd35f..0d3643ae 100644
--- a/include/main.h
+++ b/include/main.h
@@ -89,7 +89,7 @@ extern void DoSoftReset(void);
 extern void sub_08056260(void);
 extern void VBlankIntrWait();
 extern void MessageUpdate(void);
-extern void sub_08050154(void);
+extern void UpdateFade(void);
 
 extern u8 gUnk_03003DE4;
 
diff --git a/include/structures.h b/include/structures.h
index 86962b43..5298e1f5 100644
--- a/include/structures.h
+++ b/include/structures.h
@@ -93,7 +93,7 @@ typedef struct {
     u8 field_0x1;
     u8 field_0x2;
     u8 field_0x3;
-    u32 field_0x4;
+    u32 mask;
     u16 fadeType;  // fade in or out, are there others?
     u16 fadeSpeed; // subtracted from duration
     u16 fadeDuration;
@@ -103,9 +103,9 @@ typedef struct {
     s16 field_0x14;
     u16 field_0x16;
     u16 field_0x18;
-} struct_03000FD0;
+} FadeControl;
 
-extern struct_03000FD0 gFadeControl;
+extern FadeControl gFadeControl;
 
 typedef struct {
     u8 filler0[0x1A];
diff --git a/include/tiles.h b/include/tiles.h
new file mode 100644
index 00000000..9915face
--- /dev/null
+++ b/include/tiles.h
@@ -0,0 +1,18 @@
+#ifndef TILES_H
+#define TILES_H
+
+typedef enum {
+    CUT_BUSH = 0x1C,
+    CUT_GRASS = 0x1D,
+    CUT_SIGNPOST = 0x1E,
+    CUT_TREE = 0x1F,
+    ROCK = 0x55,
+    CHEST = 0x73,
+    SIGNPOST = 0x176,
+    PERMA_ROCK = 0x1D3,
+    PERMA_ROCK2 = 0x1D4,
+    PERMA_ROCK3 = 0x1D5,
+    PERMA_ROCK4 = 0x1D6,
+} Tile;
+
+#endif // TILES_H
diff --git a/src/audio.c b/src/audio.c
index e8301fd6..32cd2f11 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -198,7 +198,6 @@ s32 fade(s32 target, s32 current) {
 
 void doPlaySound(u32 sound) {
     u32 volume;
-    u32 iVar2;
     MusicPlayerInfo* musicPlayerInfo;
 
     if (sound == 0)
@@ -209,8 +208,7 @@ void doPlaySound(u32 sound) {
     } else {
         volume = gSoundPlayingInfo.volumeSfx;
     }
-    iVar2 = gSoundPlayingInfo.volumeMaster;
-    volume = iVar2 * volume / 0x100;
+    volume = gSoundPlayingInfo.volumeMaster * volume / 0x100;
     musicPlayerInfo = gMusicPlayers[gSongTable[sound].musicPlayerIndex].info;
     m4aMPlayImmInit(musicPlayerInfo);
     m4aMPlayVolumeControl(musicPlayerInfo, 0xffff, volume);
diff --git a/src/game.c b/src/game.c
index 69f344b8..ee37c155 100644
--- a/src/game.c
+++ b/src/game.c
@@ -67,7 +67,7 @@ void sub_0805212C(void) {
 #else
                 sub_08052418(0, 0);
                 gScreen.lcd.displayControl |= 0x600;
-                gFadeControl.field_0x4 = 0xffff;
+                gFadeControl.mask = 0x0000ffff;
                 DoFade(4, 0x10);
 #endif
             }
@@ -97,7 +97,7 @@ void sub_080521A0(void) {
             gMenu.field_0x3 = 0;
             sub_080A7114(1);
             sub_08052418(0, 0);
-            gFadeControl.field_0x4 = 0xffffffff;
+            gFadeControl.mask = 0xffffffff;
             break;
         case 1:
             if (gMenu.transitionTimer == 0) {
diff --git a/src/intro.c b/src/intro.c
index a181800e..55e7cad6 100644
--- a/src/intro.c
+++ b/src/intro.c
@@ -285,7 +285,7 @@ static void HandleJapaneseTitlescreenAnimationIntro(void) {
                     gIntroState.subState++;
                     gScreen.bg.bg1yOffset = 0;
                     gScreen.bg.bg1Control = 0xc09;
-                    gFadeControl.field_0x4 = 0x40;
+                    gFadeControl.mask = 0x00000040;
                     DoFade(6, 0x10);
                     SoundReq(SFX_F8);
                 }
@@ -293,7 +293,7 @@ static void HandleJapaneseTitlescreenAnimationIntro(void) {
             break;
         case 1:
             if (!gFadeControl.active) {
-                gFadeControl.field_0x4 = -1;
+                gFadeControl.mask = 0xFFFFFFFF;
                 gIntroState.subState++;
 #if defined(JP) || defined(EU)
                 gIntroState.timer = 120;
diff --git a/src/main.c b/src/main.c
index 421fe0f1..08a6f0fc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -81,7 +81,7 @@ void AgbMain(void) {
                 gMain.ticks++;
                 sScreenHandlers[gMain.screen]();
                 MessageUpdate();
-                sub_08050154();
+                UpdateFade();
                 SoundLoop();
                 break;
         }
diff --git a/src/manager/managerF.c b/src/manager/managerF.c
index d7e1d7bb..76e49700 100644
--- a/src/manager/managerF.c
+++ b/src/manager/managerF.c
@@ -9,6 +9,7 @@
 #include "textbox.h"
 #include "script.h"
 #include "utils.h"
+#include "tiles.h"
 
 void sub_08058ECC(ManagerF*);
 
@@ -335,7 +336,7 @@ void sub_0805930C(ManagerF* this) {
 }
 
 void SetDirtTile(u32 tile) {
-    SetTileType(0x1d, tile, 1);
+    SetTileType(CUT_GRASS, tile, 1);
     SetTileType(0, tile, 2);
     SetTileType(0, tile - 0x40, 2);
 }
diff --git a/src/script.c b/src/script.c
index fd1c2dcf..16cdac39 100644
--- a/src/script.c
+++ b/src/script.c
@@ -75,7 +75,7 @@ void ScriptCommand_WaitForPlayerAction0x17(Entity* entity, ScriptExecutionContex
 void ScriptCommand_WaitFor_1(Entity* entity, ScriptExecutionContext* context);
 void ScriptCommand_WaitFor_2(Entity* entity, ScriptExecutionContext* context);
 void ScriptCommand_0807E778(Entity* entity, ScriptExecutionContext* context);
-void ScriptCommand_0807E788(Entity* entity, ScriptExecutionContext* context);
+void ScriptCommand_SetFadeMask(Entity* entity, ScriptExecutionContext* context);
 void ScriptCommand_0807E79C(Entity* entity, ScriptExecutionContext* context);
 void ScriptCommandNop2(Entity* entity, ScriptExecutionContext* context);
 void ScriptCommand_DoFade4(Entity* entity, ScriptExecutionContext* context);
@@ -220,7 +220,7 @@ const ScriptCommand gScriptCommands[] = { ScriptCommandNop,
                                           ScriptCommand_WaitFor_1,
                                           ScriptCommand_WaitFor_2,
                                           ScriptCommand_0807E778,
-                                          ScriptCommand_0807E788,
+                                          ScriptCommand_SetFadeMask,
                                           ScriptCommand_0807E79C,
                                           ScriptCommandNop2,
                                           ScriptCommand_DoFade4,
@@ -1005,8 +1005,8 @@ void ScriptCommand_0807E778(Entity* entity, ScriptExecutionContext* context) {
     gActiveScriptInfo.unk_08 = context->scriptInstructionPointer[1];
 }
 
-void ScriptCommand_0807E788(Entity* entity, ScriptExecutionContext* context) {
-    gFadeControl.field_0x4 = GetNextScriptCommandWordAfterCommandMetadata(context->scriptInstructionPointer);
+void ScriptCommand_SetFadeMask(Entity* entity, ScriptExecutionContext* context) {
+    gFadeControl.mask = GetNextScriptCommandWordAfterCommandMetadata(context->scriptInstructionPointer);
 }
 
 void ScriptCommand_0807E79C(Entity* entity, ScriptExecutionContext* context) {
diff --git a/src/sub_08050008.c b/src/sub_08050008.c
index df79883a..580c3a32 100644
--- a/src/sub_08050008.c
+++ b/src/sub_08050008.c
@@ -6,5 +6,5 @@ extern u32 gUnk_020354C0;
 
 void sub_08050008() {
     MemClear(&gUnk_020354C0, 128);
-    gFadeControl.field_0x4 = -1;
+    gFadeControl.mask = 0xFFFFFFFF;
 }
diff --git a/src/sub_0805E374.c b/src/sub_0805E374.c
index e035ce07..3ec3e287 100644
--- a/src/sub_0805E374.c
+++ b/src/sub_0805E374.c
@@ -9,7 +9,7 @@ Entity* sub_0805E374(Entity* param_1) {
     u8 r3 = gScreenTransition.field_0x24[8];
     u8* array = gUnk_081091F8;
 
-    if (r3 != '\x02') {
+    if (r3 != 2) {
         array = gUnk_081091EE;
     }
     return sub_0805E3A0(param_1, array[param_1->kind]);
diff --git a/src/sub_0807B820.c b/src/sub_0807B820.c
index fabdc8d9..14da7b18 100644
--- a/src/sub_0807B820.c
+++ b/src/sub_0807B820.c
@@ -9,46 +9,46 @@ void sub_0807B7D8(u32 param_1, u32 param_2, u32 param_3) {
         sub_08000152(53);
         sub_0807B778(param_2, param_3);
         sub_0807B778(param_2 + 1, param_3);
-        sub_0807B778(param_2 + -1, param_3);
+        sub_0807B778(param_2 - 1, param_3);
         sub_0807B778(param_2 + 64, param_3);
-        sub_0807B778(param_2 + -64, param_3);
+        sub_0807B778(param_2 - 64, param_3);
     } else {
         SetTileType(param_1, param_2, param_3);
     }
 }
 
 void sub_0807B820(u32 param_1) {
-    SetTileType(620, param_1 + -65, 1);
-    SetTileType(627, param_1 + -65, 2);
-    SetTileType(621, param_1 + -64, 1);
-    SetTileType(628, param_1 + -64, 2);
-    SetTileType(622, param_1 + -63, 1);
-    SetTileType(629, param_1 + -63, 2);
-    SetTileType(623, param_1 + -1, 1);
+    SetTileType(620, param_1 - 65, 1);
+    SetTileType(627, param_1 - 65, 2);
+    SetTileType(621, param_1 - 64, 1);
+    SetTileType(628, param_1 - 64, 2);
+    SetTileType(622, param_1 - 63, 1);
+    SetTileType(629, param_1 - 63, 2);
+    SetTileType(623, param_1 - 1, 1);
     SetTileType(624, param_1, 1);
     SetTileType(626, param_1 + 1, 1);
 }
 
 void sub_0807B8A8(u32 param_1) {
-    SetTileType(636, param_1 + -65, 1);
-    SetTileType(643, param_1 + -65, 2);
-    SetTileType(637, param_1 + -64, 1);
-    SetTileType(644, param_1 + -64, 2);
-    SetTileType(638, param_1 + -63, 1);
-    SetTileType(645, param_1 + -63, 2);
-    SetTileType(639, param_1 + -1, 1);
+    SetTileType(636, param_1 - 65, 1);
+    SetTileType(643, param_1 - 65, 2);
+    SetTileType(637, param_1 - 64, 1);
+    SetTileType(644, param_1 - 64, 2);
+    SetTileType(638, param_1 - 63, 1);
+    SetTileType(645, param_1 - 63, 2);
+    SetTileType(639, param_1 - 1, 1);
     SetTileType(640, param_1, 1);
     SetTileType(642, param_1 + 1, 1);
 }
 
 void sub_0807B930(int param_1) {
-    SetTileType(652, param_1 + -65, 1);
-    SetTileType(659, param_1 + -65, 2);
-    SetTileType(653, param_1 + -64, 1);
-    SetTileType(660, param_1 + -64, 2);
-    SetTileType(654, param_1 + -63, 1);
-    SetTileType(661, param_1 + -63, 2);
-    SetTileType(655, param_1 + -1, 1);
+    SetTileType(652, param_1 - 65, 1);
+    SetTileType(659, param_1 - 65, 2);
+    SetTileType(653, param_1 - 64, 1);
+    SetTileType(660, param_1 - 64, 2);
+    SetTileType(654, param_1 - 63, 1);
+    SetTileType(661, param_1 - 63, 2);
+    SetTileType(655, param_1 - 1, 1);
     SetTileType(656, param_1, 1);
     SetTileType(658, param_1 + 1, 1);
 }
diff --git a/src/sub_080A554C.c b/src/sub_080A554C.c
index 4ec59e7f..dffcbab0 100644
--- a/src/sub_080A554C.c
+++ b/src/sub_080A554C.c
@@ -11,7 +11,7 @@ u32 sub_080A554C(u32 arg0) {
 
     if (arg0 != 0) {
         for (i = 0; i < 17; i++) {
-            if (arg0 == (&gUnk_02000090)[i])
+            if (arg0 == gMenu.focusCoords[i])
                 return i;
         }
     }
diff --git a/src/sub_08127D30.c b/src/sub_08127D30.c
index aa953d3a..1ce3f625 100644
--- a/src/sub_08127D30.c
+++ b/src/sub_08127D30.c
@@ -3,8 +3,5 @@
 extern u8 gUnk_08127D30[69];
 
 u32 sub_08052654(u32 r0) {
-    // u32 r1 = gUnk_08127D30;
-    // u32 r1 = gUnk_08127D30;
-
     return gUnk_08127D30[r0 * 4] == 129;
 }