diff --git a/include/game.h b/include/game.h
index 9e1bc655..3480b46b 100644
--- a/include/game.h
+++ b/include/game.h
@@ -200,7 +200,7 @@ void InitParachuteRoom(void);
  * @param onEnter Room enter callback.
  * @param onExit Room exit callback.
  */
-void RegisterTransitionManager(void* mgr, void (*onEnter)(void*), void (*onExit)(void*));
+void RegisterTransitionHandler(void* mgr, void (*onEnter)(), void (*onExit)());
 
 /**
  * Call the room exit callback.
diff --git a/include/manager.h b/include/manager.h
index c96a1785..322510c7 100644
--- a/include/manager.h
+++ b/include/manager.h
@@ -152,11 +152,6 @@ extern void (*const gMiscManagerunctions[58])();
 
 Manager* GetEmptyManager(void);
 
-/**
- * @brief Set manager responsible for handling room changes
- */
-extern void RegisterTransitionManager(void* mgr, void (*onEnter)(), void (*onExit)());
-
 extern u32 sub_0805ACC0(Entity*);
 extern void sub_0801855C(void);
 extern void SetNextAreaHint(u32 textId);
diff --git a/src/enemy/gyorgFemale.c b/src/enemy/gyorgFemale.c
index 034e8eb4..e566c480 100644
--- a/src/enemy/gyorgFemale.c
+++ b/src/enemy/gyorgFemale.c
@@ -9,10 +9,10 @@
 #include "collision.h"
 #include "enemy.h"
 #include "enemy/gyorg.h"
-#include "entity.h"
-#include "functions.h"
 #include "sound.h"
 #include "assets/map_offsets.h"
+#include "game.h"
+#include "functions.h"
 
 extern u8 gEntCount;
 extern u8 gMapDataTopSpecial[];
@@ -20,11 +20,10 @@ extern u8 gMapDataTopSpecial[];
 extern u16 gMapDataBottomSpecial[];
 
 extern u32 sub_08000E62(u32);
-extern void RegisterTransitionManager(void*, void (*)(), void (*)());
 
-void sub_08046498();
+void GyorgFemale_OnEnterRoom();
 void sub_0804660C(GyorgFemaleEntity*, u32);
-void sub_080464C0(GyorgFemaleEntity*);
+void GyorgFemale_Reset(GyorgFemaleEntity*);
 void GyorgFemale_SpawnChildren(GyorgFemaleEntity* this, bool32 unlimit_tmp);
 void sub_080465C8(void);
 void GyorgFemale_ProcessEyeHit(GyorgFemaleEntity* this);
@@ -92,13 +91,13 @@ void GyorgFemale_Setup(GyorgFemaleEntity* this) {
     MemClear(&gMapDataBottomSpecial, 0x8000);
     MemClear(&gMapDataTopSpecial, 0x8000);
     sub_0804660C(this, 0);
-    sub_080464C0(this);
+    GyorgFemale_Reset(this);
     gPlayerEntity.base.collisionLayer = 2;
     UpdateSpriteForCollisionLayer(&gPlayerEntity.base);
 #ifndef EU
-    RegisterTransitionManager(this, sub_08046498, 0);
+    RegisterTransitionHandler(this, GyorgFemale_OnEnterRoom, NULL);
 #else
-    RegisterTransitionManager(this, sub_080464C0, 0);
+    RegisterTransitionHandler(this, GyorgFemale_Reset, NULL);
 #endif
 }
 
@@ -110,7 +109,7 @@ void GyorgFemale_Action1(GyorgFemaleEntity* this) {
     } else {
         if (this->unk_79 & 0x40) {
             this->unk_79 &= ~0x40;
-            sub_080464C0(this);
+            GyorgFemale_Reset(this);
         }
     }
     sub_080465C8();
@@ -217,14 +216,14 @@ void GyorgFemale_Action3(GyorgFemaleEntity* this) {
 }
 
 #ifndef EU
-void sub_08046498(GyorgFemaleEntity* this) {
+void GyorgFemale_OnEnterRoom(GyorgFemaleEntity* this) {
     MemClear(&gMapDataBottomSpecial, 0x8000);
     MemClear(&gMapDataTopSpecial, 0x8000);
-    sub_080464C0(this);
+    GyorgFemale_Reset(this);
 }
 #endif
 
-void sub_080464C0(GyorgFemaleEntity* this) {
+void GyorgFemale_Reset(GyorgFemaleEntity* this) {
     static const MapDataDefinition* const gyorgMappings[] = {
         gGyorgMapping0,
         gGyorgMapping1,
diff --git a/src/gameUtils.c b/src/gameUtils.c
index 2f54867d..4087bd32 100644
--- a/src/gameUtils.c
+++ b/src/gameUtils.c
@@ -531,7 +531,7 @@ u32 GetFlagBankOffset(u32 idx) {
     return gLocalFlagBanks[a_hdr->flag_bank];
 }
 
-void RegisterTransitionManager(void* mgr, void (*onEnter)(), void (*onExit)()) {
+void RegisterTransitionHandler(void* mgr, void (*onEnter)(), void (*onExit)()) {
     if (gMain.substate != GAMEMAIN_SUBTASK) {
         gArea.transitionManager = mgr;
         gArea.onEnter = onEnter;
diff --git a/src/manager/cloudOverlayManager.c b/src/manager/cloudOverlayManager.c
index b9563b46..a9313b45 100644
--- a/src/manager/cloudOverlayManager.c
+++ b/src/manager/cloudOverlayManager.c
@@ -6,19 +6,20 @@
  */
 #include "manager/cloudOverlayManager.h"
 #include "area.h"
-#include "functions.h"
 #include "screen.h"
+#include "game.h"
+#include "functions.h"
 
-void sub_0805AEDC(CloudOverlayManager*);
-void sub_0805AF3C(CloudOverlayManager*);
+void CloudOverlayManager_OnEnterRoom(CloudOverlayManager*);
+void CloudOverlayManager_OnExitRoom(CloudOverlayManager*);
 
 void CloudOverlayManager_Main(CloudOverlayManager* this) {
     static const u16 gUnk_0810865C[] = {
         0xf01, 0xe02, 0xe03, 0xe04, 0, 0,
     };
     if (this == NULL) {
-        if (gArea.onEnter != sub_0805AEDC) {
-            sub_0805AEDC(NULL);
+        if (gArea.onEnter != CloudOverlayManager_OnEnterRoom) {
+            CloudOverlayManager_OnEnterRoom(NULL);
         }
     } else {
         if (super->action == 0) {
@@ -29,7 +30,7 @@ void CloudOverlayManager_Main(CloudOverlayManager* this) {
             this->field_0x20 = gUnk_0810865C[0];
             SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
             if (gArea.onEnter == NULL) {
-                RegisterTransitionManager(this, sub_0805AEDC, sub_0805AF3C);
+                RegisterTransitionHandler(this, CloudOverlayManager_OnEnterRoom, CloudOverlayManager_OnExitRoom);
             } else {
                 DeleteThisEntity();
             }
@@ -49,7 +50,7 @@ void CloudOverlayManager_Main(CloudOverlayManager* this) {
     }
 }
 
-void sub_0805AEDC(CloudOverlayManager* this) {
+void CloudOverlayManager_OnEnterRoom(CloudOverlayManager* this) {
     gScreen.bg3.control = BGCNT_SCREENBASE(30) | BGCNT_PRIORITY(1) | BGCNT_CHARBASE(1);
     gScreen.lcd.displayControl |= DISPCNT_BG3_ON;
     gScreen.controls.layerFXControl =
@@ -62,7 +63,7 @@ void sub_0805AEDC(CloudOverlayManager* this) {
     }
 }
 
-void sub_0805AF3C(CloudOverlayManager* this) {
+void CloudOverlayManager_OnExitRoom(CloudOverlayManager* this) {
     super->flags &= ~ENT_PERSIST;
     gScreen.lcd.displayControl &= ~DISPCNT_BG3_ON;
     gScreen.controls.layerFXControl = 0;
diff --git a/src/manager/holeManager.c b/src/manager/holeManager.c
index 0ae74a87..3772ceb1 100644
--- a/src/manager/holeManager.c
+++ b/src/manager/holeManager.c
@@ -10,6 +10,7 @@
 #include "object.h"
 #include "room.h"
 #include "screen.h"
+#include "game.h"
 #include "manager/lightManager.h"
 #include "assets/gfx_offsets.h"
 #include "functions.h"
@@ -155,7 +156,7 @@ void HoleManager_Main(HoleManager* this) {
 bool32 IsPlayerOnHole(HoleManager*);
 void DoHoleTransition(HoleManager*);
 void HoleManager_UpdateParallaxBackground(HoleManager*);
-void HoleManager_InitParallaxBackground(HoleManager*);
+void HoleManager_OnEnterRoom(HoleManager*);
 
 void HoleManager_Init(HoleManager* this) {
     const HoleTransition* transition;
@@ -185,8 +186,8 @@ void HoleManager_Init(HoleManager* this) {
         this->persistance_y = transition->parallax_background->y;
         UnDarkRoom();
         HoleManager_UpdateParallaxBackground(this);
-        HoleManager_InitParallaxBackground(this);
-        RegisterTransitionManager(this, HoleManager_InitParallaxBackground, NULL);
+        HoleManager_OnEnterRoom(this);
+        RegisterTransitionHandler(this, HoleManager_OnEnterRoom, NULL);
     }
     if (!transition->parallax_entity)
         return;
@@ -297,7 +298,7 @@ void HoleManager_UpdateParallaxBackground(HoleManager* this) {
     gScreen.bg3.yOffset = gRoomControls.bg3OffsetY.HALF.HI = gRoomControls.scroll_y + this->persistance_offset_y + y;
 }
 
-void HoleManager_InitParallaxBackground(HoleManager* this) {
+void HoleManager_OnEnterRoom(HoleManager* this) {
     const HoleTransition* transition;
     if (!super->type2)
         return;
diff --git a/src/manager/horizontalMinishPathBackgroundManager.c b/src/manager/horizontalMinishPathBackgroundManager.c
index 5d5d1ae7..1f07763f 100644
--- a/src/manager/horizontalMinishPathBackgroundManager.c
+++ b/src/manager/horizontalMinishPathBackgroundManager.c
@@ -6,11 +6,12 @@
  */
 #include "manager/horizontalMinishPathBackgroundManager.h"
 #include "common.h"
-#include "functions.h"
 #include "screen.h"
+#include "game.h"
+#include "functions.h"
 
 void sub_08057F20(HorizontalMinishPathBackgroundManager*);
-void sub_08057EFC(void*);
+void HorizontalMinishPathBackgroundManager_OnEnterRoom(HorizontalMinishPathBackgroundManager*);
 void sub_08058034(void);
 void sub_08058084(u16*, u16*);
 void sub_08058004(u32, void*, void*);
@@ -24,38 +25,38 @@ void HorizontalMinishPathBackgroundManager_Main(HorizontalMinishPathBackgroundMa
         super->action = 1;
         gScreen.bg1.updated = 0;
         gScreen.bg3.updated = 0;
-        RegisterTransitionManager(this, sub_08057EFC, NULL);
+        RegisterTransitionHandler(this, HorizontalMinishPathBackgroundManager_OnEnterRoom, NULL);
     }
 }
 
-void sub_08057EFC(void* this) {
-    LoadGfxGroup((u32)gRoomVars.graphicsGroups[0]);
+void HorizontalMinishPathBackgroundManager_OnEnterRoom(HorizontalMinishPathBackgroundManager* this) {
+    LoadGfxGroup(gRoomVars.graphicsGroups[0]);
     sub_08058034();
-    ((HorizontalMinishPathBackgroundManager*)this)->unk_3c = 0;
-    ((HorizontalMinishPathBackgroundManager*)this)->unk_38 = 0;
-    sub_08057F20(((HorizontalMinishPathBackgroundManager*)this));
+    this->unk_3c = 0;
+    this->unk_38 = 0;
+    sub_08057F20(this);
 }
 
 void sub_08057F20(HorizontalMinishPathBackgroundManager* this) {
     u32 tmp;
     tmp = gRoomControls.scroll_x - gRoomControls.origin_x;
-    tmp = tmp + (tmp >> 3) + ((0x400 - gRoomControls.width) / 2);
+    tmp = tmp + (tmp >> 3) + (0x400 - gRoomControls.width) / 2;
     gScreen.bg3.xOffset = tmp & 0xF;
     gScreen.bg3.yOffset = 0x30 - ((0x30 - (gRoomControls.scroll_y - gRoomControls.origin_y)) >> 2);
     gScreen.bg3.subTileMap = gBG3Buffer;
     sub_08058004(tmp, gUnk_02006F00, gBG3Buffer);
-    tmp = ((tmp >> 4) << 1);
+    tmp = (tmp >> 4) << 1;
     if (this->unk_38 != tmp) {
         this->unk_38 = tmp;
         gScreen.bg3.updated = 1;
     }
-    tmp = (gRoomControls.scroll_x - gRoomControls.origin_x);
-    tmp = tmp + (tmp >> 2) + ((0x400 - gRoomControls.width) / 2);
+    tmp = gRoomControls.scroll_x - gRoomControls.origin_x;
+    tmp = tmp + (tmp >> 2) + (0x400 - gRoomControls.width) / 2;
     gScreen.bg1.xOffset = tmp & 0xF;
     gScreen.bg1.yOffset = 0x30 - ((0x30 - (gRoomControls.scroll_y - gRoomControls.origin_y)) >> 1);
     gScreen.bg1.subTileMap = gBG3Buffer + 0x400;
     sub_08058004(tmp, gUnk_02006F00 + 0x2000, gBG3Buffer + 0x400);
-    tmp = ((tmp >> 4) << 1);
+    tmp = (tmp >> 4) << 1;
     if (this->unk_3c != tmp) {
         this->unk_3c = tmp;
         gScreen.bg1.updated = 1;
diff --git a/src/manager/hyruleTownTileSetManager.c b/src/manager/hyruleTownTileSetManager.c
index f6105c2a..2d19ac6d 100644
--- a/src/manager/hyruleTownTileSetManager.c
+++ b/src/manager/hyruleTownTileSetManager.c
@@ -11,11 +11,12 @@
 #include "main.h"
 #include "room.h"
 #include "tiles.h"
+#include "game.h"
 #include "assets/gfx_offsets.h"
 #include "functions.h"
 
 void HyruleTownTileSetManager_UpdateLoadGfxGroups(HyruleTownTileSetManager*);
-void HyruleTownTileSetManager_Reset(HyruleTownTileSetManager*);
+void HyruleTownTileSetManager_OnEnterRoom(HyruleTownTileSetManager*);
 
 // clang-format off
 static const u16 gHyruleTownTileSetManager_regions0[] = {
@@ -86,13 +87,13 @@ void HyruleTownTileSetManager_Main(HyruleTownTileSetManager* this) {
         this->gfxGroup2 = 0xff;
         this->gfxGroup1 = 0xff;
         this->gfxGroup0 = 0xff;
-        RegisterTransitionManager(this, HyruleTownTileSetManager_Reset, NULL);
+        RegisterTransitionHandler(this, HyruleTownTileSetManager_OnEnterRoom, NULL);
         SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
     }
     HyruleTownTileSetManager_UpdateLoadGfxGroups(this);
 }
 
-void HyruleTownTileSetManager_Reset(HyruleTownTileSetManager* this) {
+void HyruleTownTileSetManager_OnEnterRoom(HyruleTownTileSetManager* this) {
     gRoomVars.graphicsGroups[2] = 0xff;
     gRoomVars.graphicsGroups[1] = 0xff;
     gRoomVars.graphicsGroups[0] = 0xff;
diff --git a/src/manager/lightRayManager.c b/src/manager/lightRayManager.c
index 4a6c4227..65fd416b 100644
--- a/src/manager/lightRayManager.c
+++ b/src/manager/lightRayManager.c
@@ -12,6 +12,7 @@
 #include "functions.h"
 #include "main.h"
 #include "screen.h"
+#include "game.h"
 
 extern void DisableVBlankDMA(void);
 
@@ -47,7 +48,7 @@ void LightRayManager_Main(LightRayManager* this) {
     }
 }
 
-static void LightRayManager_EnterRoom(LightRayManager* this) {
+static void LightRayManager_OnEnterRoom(LightRayManager* this) {
     u8* pbVar1;
 
     LoadGfxGroup(this->gfxGroup);
@@ -60,7 +61,7 @@ static void LightRayManager_EnterRoom(LightRayManager* this) {
     }
 }
 
-static void LightRayManager_ExitRoom(void) {
+static void LightRayManager_OnExitRoom(void) {
     gScreen.lcd.displayControl &= ~DISPCNT_BG3_ON;
     gScreen.controls.layerFXControl = 0;
     DisableVBlankDMA();
@@ -76,7 +77,7 @@ void LightRayManager_Init(LightRayManager* this) {
     gScreen.lcd.displayControl |= DISPCNT_BG3_ON;
     gScreen.controls.layerFXControl = 0x3648;
     gScreen.controls.alphaBlend = 0x1000;
-    RegisterTransitionManager(this, LightRayManager_EnterRoom, LightRayManager_ExitRoom);
+    RegisterTransitionHandler(this, LightRayManager_OnEnterRoom, LightRayManager_OnExitRoom);
 }
 
 void LightRayManager_Action1(LightRayManager* this) {
diff --git a/src/manager/minishRaftersBackgroundManager.c b/src/manager/minishRaftersBackgroundManager.c
index f92470d6..c3a9d629 100644
--- a/src/manager/minishRaftersBackgroundManager.c
+++ b/src/manager/minishRaftersBackgroundManager.c
@@ -6,10 +6,11 @@
  */
 #include "manager/minishRaftersBackgroundManager.h"
 #include "common.h"
-#include "functions.h"
 #include "room.h"
+#include "game.h"
+#include "functions.h"
 
-void sub_08058204(MinishRaftersBackgroundManager*);
+void MinishRaftersBackgroundManager_OnEnterRoom(MinishRaftersBackgroundManager*);
 void sub_08058210(MinishRaftersBackgroundManager*);
 u32 sub_08058244(int);
 void sub_080582A0(u32, u32*, u16*);
@@ -23,11 +24,11 @@ void MinishRaftersBackgroundManager_Main(MinishRaftersBackgroundManager* this) {
     if (super->action == 0) {
         super->action = 1;
         gScreen.bg1.updated = 0;
-        RegisterTransitionManager(this, sub_08058204, NULL);
+        RegisterTransitionHandler(this, MinishRaftersBackgroundManager_OnEnterRoom, NULL);
     }
 }
 
-void sub_08058204(MinishRaftersBackgroundManager* this) {
+void MinishRaftersBackgroundManager_OnEnterRoom(MinishRaftersBackgroundManager* this) {
     sub_08058324(super->type);
 }
 
diff --git a/src/manager/minishVillageTileSetManager.c b/src/manager/minishVillageTileSetManager.c
index 0f5b2674..95cb7cc4 100644
--- a/src/manager/minishVillageTileSetManager.c
+++ b/src/manager/minishVillageTileSetManager.c
@@ -8,10 +8,11 @@
 #include "asm.h"
 #include "common.h"
 #include "main.h"
+#include "game.h"
 #include "assets/gfx_offsets.h"
 #include "functions.h"
 
-void MinishVillageTileSetManager_LoadRoomGfxGroup(void*);
+void MinishVillageTileSetManager_OnEnterRoom(void*);
 bool32 MinishVillageTileSetManager_UpdateRoomGfxGroup(MinishVillageTileSetManager*);
 void MinishVillageTileSetManager_LoadGfxGroup(u32);
 
@@ -106,7 +107,7 @@ void MinishVillageTileSetManager_Main(MinishVillageTileSetManager* this) {
 #ifndef EU
         SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
 #endif
-        RegisterTransitionManager(this, MinishVillageTileSetManager_LoadRoomGfxGroup, 0);
+        RegisterTransitionHandler(this, MinishVillageTileSetManager_OnEnterRoom, NULL);
     }
 #ifdef EU
     if (gRoomControls.reload_flags)
@@ -175,7 +176,7 @@ void MinishVillageTileSetManager_Main(MinishVillageTileSetManager* this) {
 #endif
 }
 
-void MinishVillageTileSetManager_LoadRoomGfxGroup(void* this) {
+void MinishVillageTileSetManager_OnEnterRoom(void* this) {
     MinishVillageTileSetManager_LoadGfxGroup(gRoomVars.graphicsGroups[0]);
 }
 
diff --git a/src/manager/powBackgroundManager.c b/src/manager/powBackgroundManager.c
index d7a24f25..bbb29c7d 100644
--- a/src/manager/powBackgroundManager.c
+++ b/src/manager/powBackgroundManager.c
@@ -8,13 +8,14 @@
 #include "area.h"
 #include "room.h"
 #include "screen.h"
+#include "game.h"
 
-void sub_0805AFFC(PowBackgroundManager*);
+void PowBackgroundManager_OnEnterRoom(PowBackgroundManager*);
 
 void PowBackgroundManager_Main(PowBackgroundManager* this) {
     if (this == NULL) {
-        if ((void*)gArea.onEnter != sub_0805AFFC) {
-            sub_0805AFFC(this);
+        if ((void*)gArea.onEnter != PowBackgroundManager_OnEnterRoom) {
+            PowBackgroundManager_OnEnterRoom(this);
         }
     } else {
         if (super->action == 0) {
@@ -22,7 +23,7 @@ void PowBackgroundManager_Main(PowBackgroundManager* this) {
             super->flags |= ENT_PERSIST;
             SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
             if (gArea.onEnter == NULL) {
-                RegisterTransitionManager(this, sub_0805AFFC, NULL);
+                RegisterTransitionHandler(this, PowBackgroundManager_OnEnterRoom, NULL);
             } else {
                 DeleteThisEntity();
             }
@@ -34,7 +35,7 @@ void PowBackgroundManager_Main(PowBackgroundManager* this) {
     }
 }
 
-void sub_0805AFFC(PowBackgroundManager* this) {
+void PowBackgroundManager_OnEnterRoom(PowBackgroundManager* this) {
     gScreen.bg3.control = BGCNT_PRIORITY(3) | BGCNT_SCREENBASE(30);
     gScreen.lcd.displayControl |= DISPCNT_BG3_ON;
     gScreen.bg3.xOffset = gRoomControls.scroll_x + gRoomControls.bg3OffsetX.HALF.HI;
diff --git a/src/manager/rollingBarrelManager.c b/src/manager/rollingBarrelManager.c
index 7f44557b..303108a5 100644
--- a/src/manager/rollingBarrelManager.c
+++ b/src/manager/rollingBarrelManager.c
@@ -8,21 +8,21 @@
 #include "area.h"
 #include "common.h"
 #include "flags.h"
-#include "functions.h"
 #include "main.h"
 #include "physics.h"
 #include "room.h"
 #include "save.h"
 #include "screen.h"
 #include "sound.h"
-#include "structures.h"
+#include "game.h"
+#include "functions.h"
 
 extern struct BgAffineDstData gUnk_02017AA0[];
 extern struct BgAffineDstData gUnk_02017BA0[];
 extern u8 gUpdateVisibleTiles;
 extern u32 gUsedPalettes;
 
-void sub_08058D34(void);
+void RollingBarrelManager_OnEnterRoom(void);
 void sub_08058BC8(RollingBarrelManager*);
 void sub_08058CB0(RollingBarrelManager*);
 void sub_08058CFC(void);
@@ -52,7 +52,7 @@ void RollingBarrelManager_Init(RollingBarrelManager* this) {
     this->unk_28 = 0x1234;
     super->timer = CheckLocalFlags(0x15, 0x2) != 0;
     sub_08058CB0(this);
-    RegisterTransitionManager(this, sub_08058D34, 0);
+    RegisterTransitionHandler(this, RollingBarrelManager_OnEnterRoom, NULL);
 }
 
 void RollingBarrelManager_Action1(RollingBarrelManager* this) {
@@ -256,7 +256,7 @@ void sub_08058CFC(void) {
     }
 }
 
-void sub_08058D34(void) {
+void RollingBarrelManager_OnEnterRoom(void) {
     u16 tmp;
     u32 tmp2;
     LoadPaletteGroup(0x28);
diff --git a/src/manager/staticBackgroundManager.c b/src/manager/staticBackgroundManager.c
index 2163b280..de3c8f3d 100644
--- a/src/manager/staticBackgroundManager.c
+++ b/src/manager/staticBackgroundManager.c
@@ -6,10 +6,11 @@
  */
 #include "manager/staticBackgroundManager.h"
 #include "common.h"
-#include "functions.h"
 #include "screen.h"
+#include "game.h"
+#include "functions.h"
 
-void sub_0805B4B4(StaticBackgroundManager*);
+void StaticBackgroundManager_OnEnterRoom(StaticBackgroundManager*);
 void sub_0805B448(StaticBackgroundManager*);
 void sub_0805B474(StaticBackgroundManager*);
 
@@ -37,7 +38,7 @@ void StaticBackgroundManager_Main(StaticBackgroundManager* this) {
         super->flags |= ENT_PERSIST;
         SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
         if (super->type != 0) {
-            RegisterTransitionManager(this, sub_0805B4B4, NULL);
+            RegisterTransitionHandler(this, StaticBackgroundManager_OnEnterRoom, NULL);
         }
         iVar3 = 0x100 - (u32)gRoomControls.height;
         if (iVar3 < 0) {
@@ -62,7 +63,7 @@ void sub_0805B474(StaticBackgroundManager* this) {
     gScreen.bg3.xOffset = gRoomControls.scroll_x - ((gRoomControls.width - 0x100) / 2);
 }
 
-void sub_0805B4B4(StaticBackgroundManager* this) {
+void StaticBackgroundManager_OnEnterRoom(StaticBackgroundManager* this) {
     LoadStaticBackground(super->type);
     if (super->type == 2) {
         sub_0806D0F8();
diff --git a/src/manager/steamOverlayManager.c b/src/manager/steamOverlayManager.c
index 0052f5e1..358f70f7 100644
--- a/src/manager/steamOverlayManager.c
+++ b/src/manager/steamOverlayManager.c
@@ -10,6 +10,7 @@
 #include "physics.h"
 #include "room.h"
 #include "screen.h"
+#include "game.h"
 
 const u16 gUnk_08108588[] = { 0x1000, 0xF01, 0xE02, 0xD03, 0xC04, 0xB05, 0xA06, 0x907, 0x808 };
 
@@ -26,8 +27,8 @@ void sub_0805A098(SteamOverlayManager*);
 void SteamOverlayManager_Action3(SteamOverlayManager*);
 void sub_0805A114(u32, u32);
 void sub_0805A1D8(SteamOverlayManager*);
-void nullsub_495(void*);
-void sub_0805A25C(void*);
+void SteamOverlayManager_OnEnterRoom(void*);
+void SteamOverlayManager_OnExitRoom(void*);
 
 void SteamOverlayManager_Main(SteamOverlayManager* this) {
     static void (*const SteamOverlayManager_Actions[])(SteamOverlayManager*) = {
@@ -55,7 +56,7 @@ void SteamOverlayManager_Init(SteamOverlayManager* this) {
     gScreen.controls.alphaBlend = 0x1000;
     gScreen.bg3.xOffset = 0x80;
     gScreen.bg3.yOffset = 0;
-    RegisterTransitionManager(this, nullsub_495, sub_0805A25C);
+    RegisterTransitionHandler(this, SteamOverlayManager_OnEnterRoom, SteamOverlayManager_OnExitRoom);
 }
 
 void SteamOverlayManager_Action4(SteamOverlayManager* this) {
@@ -85,11 +86,11 @@ u32 sub_08059F9C(SteamOverlayManager* this) {
             if (CheckLocalFlag(0x16)) {
                 return 0;
             }
-            sub_0805A25C(this);
+            SteamOverlayManager_OnExitRoom(this);
             DeleteThisEntity();
             break;
         case 7:
-            sub_0805A25C(this);
+            SteamOverlayManager_OnExitRoom(this);
             DeleteThisEntity();
             break;
         case 0:
@@ -185,10 +186,10 @@ void sub_0805A1D8(SteamOverlayManager* this) {
     }
 }
 
-void nullsub_495(void* this) {
+void SteamOverlayManager_OnEnterRoom(void* this) {
 }
 
-void sub_0805A25C(void* this) {
+void SteamOverlayManager_OnExitRoom(void* this) {
     gScreen.controls.layerFXControl = 0;
     gScreen.lcd.displayControl &= ~DISPCNT_BG3_ON;
     DisableVBlankDMA();
diff --git a/src/manager/templeOfDropletsManager.c b/src/manager/templeOfDropletsManager.c
index 213487db..dbdbc5cb 100644
--- a/src/manager/templeOfDropletsManager.c
+++ b/src/manager/templeOfDropletsManager.c
@@ -7,10 +7,11 @@
 #include "manager/templeOfDropletsManager.h"
 #include "enemy.h"
 #include "flags.h"
-#include "functions.h"
 #include "object.h"
 #include "screen.h"
 #include "sound.h"
+#include "game.h"
+#include "functions.h"
 #include "structures.h"
 
 static const u16 gUnk_081085B8[] = { 0x1008, 0x1007, 0x1006, 0x1005, 0x1006, 0x1007, 0x1008, 0x1009,
@@ -399,7 +400,7 @@ void TempleOfDropletsManager_Type7(TempleOfDropletsManager* this) {
     }
 }
 
-void sub_0805AAC8(TempleOfDropletsManager*);
+void TempleOfDropletsManager_OnEnterRoom(TempleOfDropletsManager*);
 
 void sub_0805A89C(TempleOfDropletsManager* this) {
     SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
@@ -412,7 +413,7 @@ void sub_0805A89C(TempleOfDropletsManager* this) {
     this->unk_20 = gRoomControls.room;
     this->unk_24 = gRoomControls.origin_x;
     this->unk_26 = gRoomControls.origin_y;
-    RegisterTransitionManager(this, sub_0805AAC8, 0);
+    RegisterTransitionHandler(this, TempleOfDropletsManager_OnEnterRoom, NULL);
 }
 
 void sub_0805A94C(TempleOfDropletsManager* this);
@@ -505,7 +506,7 @@ void sub_0805AA58(TempleOfDropletsManager* this) {
     }
 }
 
-void sub_0805AAC8(TempleOfDropletsManager* this) {
+void TempleOfDropletsManager_OnEnterRoom(TempleOfDropletsManager* this) {
     sub_0805AAF0(this->unk_23);
     TempleOfDropletsManager_Main(this);
 }
diff --git a/src/manager/vaati3BackgroundManager.c b/src/manager/vaati3BackgroundManager.c
index bc8847cf..d2fb85ed 100644
--- a/src/manager/vaati3BackgroundManager.c
+++ b/src/manager/vaati3BackgroundManager.c
@@ -7,16 +7,17 @@
 #include "manager/vaati3BackgroundManager.h"
 #include "area.h"
 #include "common.h"
-#include "functions.h"
 #include "room.h"
 #include "screen.h"
+#include "game.h"
+#include "functions.h"
 
-void sub_0805D470(Vaati3BackgroundManager*);
+void Vaati3BackgroundManager_OnEnterRoom(Vaati3BackgroundManager*);
 
 void Vaati3BackgroundManager_Main(Vaati3BackgroundManager* this) {
     if (this == NULL) {
-        if (gArea.onEnter != sub_0805D470) {
-            sub_0805D470(NULL);
+        if (gArea.onEnter != Vaati3BackgroundManager_OnEnterRoom) {
+            Vaati3BackgroundManager_OnEnterRoom(NULL);
         }
     } else {
         if (super->action == 0) {
@@ -24,7 +25,7 @@ void Vaati3BackgroundManager_Main(Vaati3BackgroundManager* this) {
             super->flags |= ENT_PERSIST;
             SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
             if (gArea.onEnter == NULL) {
-                RegisterTransitionManager(this, sub_0805D470, NULL);
+                RegisterTransitionHandler(this, Vaati3BackgroundManager_OnEnterRoom, NULL);
             } else {
                 DeleteThisEntity();
             }
@@ -37,7 +38,7 @@ void Vaati3BackgroundManager_Main(Vaati3BackgroundManager* this) {
     }
 }
 
-void sub_0805D470(Vaati3BackgroundManager* this) {
+void Vaati3BackgroundManager_OnEnterRoom(Vaati3BackgroundManager* this) {
     LoadGfxGroup(0x4c);
     gScreen.bg3.control = 0x1e07;
     gScreen.lcd.displayControl |= DISPCNT_BG3_ON;
diff --git a/src/manager/verticalMinishPathBackgroundManager.c b/src/manager/verticalMinishPathBackgroundManager.c
index 645118fc..c599eae0 100644
--- a/src/manager/verticalMinishPathBackgroundManager.c
+++ b/src/manager/verticalMinishPathBackgroundManager.c
@@ -9,7 +9,7 @@
 #include "functions.h"
 #include "game.h"
 #include "screen.h"
-extern void sub_080576A0(void*);
+extern void VerticalMinishPathBackgroundManager_OnEnterRoom(void*);
 extern void sub_0805754C(VerticalMinishPathBackgroundManager*);
 
 extern u8 gMapDataTopSpecial[];
@@ -19,7 +19,7 @@ void VerticalMinishPathBackgroundManager_Main(VerticalMinishPathBackgroundManage
         super->action = 1;
         gScreen.bg3.updated = 0;
         gScreen.bg1.updated = 0;
-        RegisterTransitionManager(this, sub_080576A0, NULL);
+        RegisterTransitionHandler(this, VerticalMinishPathBackgroundManager_OnEnterRoom, NULL);
     }
     sub_0805754C(this);
 }
@@ -79,7 +79,7 @@ void sub_08057688(void) {
     gScreen.bg1.control = BGCNT_SCREENBASE(30) | BGCNT_CHARBASE(2) | BGCNT_MOSAIC;
 }
 
-void sub_080576A0(void* this) {
+void VerticalMinishPathBackgroundManager_OnEnterRoom(void* this) {
     LoadGfxGroup(gRoomVars.graphicsGroups[0]);
     ((VerticalMinishPathBackgroundManager*)this)->field_0x38 = NULL;
     ((VerticalMinishPathBackgroundManager*)this)->field_0x3c = NULL;
diff --git a/src/manager/weatherChangeManager.c b/src/manager/weatherChangeManager.c
index 57e8727b..fdddd1d6 100644
--- a/src/manager/weatherChangeManager.c
+++ b/src/manager/weatherChangeManager.c
@@ -8,14 +8,14 @@
 #include "area.h"
 #include "asm.h"
 #include "common.h"
-#include "fileselect.h"
-#include "functions.h"
 #include "main.h"
 #include "room.h"
 #include "screen.h"
 #include "sound.h"
+#include "game.h"
+#include "functions.h"
 
-void sub_080595E4(WeatherChangeManager*);
+void WeatherChangeManager_OnEnterRoom(WeatherChangeManager*);
 void sub_08059608(WeatherChangeManager*);
 void sub_08059690(WeatherChangeManager*);
 void sub_080596E0(WeatherChangeManager*);
@@ -45,14 +45,14 @@ void WeatherChangeManager_Main(WeatherChangeManager* this) {
             this->unk_22 = 5;
         }
         gRoomVars.graphicsGroups[0] = 0xFF;
-        RegisterTransitionManager(this, sub_080595E4, 0);
+        RegisterTransitionHandler(this, WeatherChangeManager_OnEnterRoom, NULL);
     }
     sub_08059608(this);
     sub_08059690(this);
     sub_080596E0(this);
 }
 
-void sub_080595E4(WeatherChangeManager* this) {
+void WeatherChangeManager_OnEnterRoom(WeatherChangeManager* this) {
     gRoomVars.graphicsGroups[0] = 0xFF;
     sub_08059690(this);
     sub_080596E0(this);
diff --git a/src/object/giantBookLadder.c b/src/object/giantBookLadder.c
index 5f18d1b4..cce94fad 100644
--- a/src/object/giantBookLadder.c
+++ b/src/object/giantBookLadder.c
@@ -4,10 +4,10 @@
  *
  * @brief Giant Book Ladder object
  */
-#include "manager.h"
 #include "map.h"
 #include "object.h"
 #include "tiles.h"
+#include "game.h"
 
 typedef struct {
     Entity base;
@@ -16,7 +16,7 @@ typedef struct {
     u16 unk76;
 } GiantBookLadderEntity;
 
-void sub_0808E55C(GiantBookLadderEntity*);
+void GiantBookLadder_OnEnterRoom(GiantBookLadderEntity*);
 u32 sub_0808E670(GiantBookLadderEntity*);
 
 void GiantBookLadder(Entity* this) {
@@ -33,14 +33,14 @@ void GiantBookLadder(Entity* this) {
         this->spritePriority.b0 = spriteDefPtr[1];
         ((GiantBookLadderEntity*)this)->unk76 = 0;
         ((GiantBookLadderEntity*)this)->unk74 = COORD_TO_TILE(this);
-        sub_0808E55C((GiantBookLadderEntity*)this);
-        RegisterTransitionManager(this, sub_0808E55C, 0);
+        GiantBookLadder_OnEnterRoom((GiantBookLadderEntity*)this);
+        RegisterTransitionHandler(this, GiantBookLadder_OnEnterRoom, NULL);
     } else if ((this->type & 1) == 0) {
         sub_0808E670((GiantBookLadderEntity*)this);
     }
 }
 
-void sub_0808E55C(GiantBookLadderEntity* this) {
+void GiantBookLadder_OnEnterRoom(GiantBookLadderEntity* this) {
     u32 type;
     u32 uVar4;
     u32 unaff_r9;
diff --git a/src/roomInit.c b/src/roomInit.c
index 26ff32d1..81366256 100644
--- a/src/roomInit.c
+++ b/src/roomInit.c
@@ -20,7 +20,7 @@ extern u32 sub_08060354(void);
 extern void MinishVillageTileSetManger_LoadInitialGfxGroup(void);
 extern void sub_0809F814(u32);
 extern void sub_080300E8(void);
-extern void sub_08058D34(void);
+extern void RollingBarrelManager_OnEnterRoom(void);
 extern void sub_0807BB98(u32, u32, u32, u32);
 extern void sub_080AF2E4(void);
 extern void sub_08059994(void);
@@ -2342,7 +2342,7 @@ u32 sub_unk3_DeepwoodShrine_InsideBarrel(void) {
 }
 
 void sub_StateChange_DeepwoodShrine_InsideBarrel(void) {
-    sub_08058D34();
+    RollingBarrelManager_OnEnterRoom();
     gArea.areaMetadata |= AR_HAS_NO_ENEMIES;
     gMain.substate = GAMEMAIN_BARRELUPDATE;
 }