diff --git a/asm/kinstone.s b/asm/kinstone.s
index adc9fdf8..ed6a123e 100644
--- a/asm/kinstone.s
+++ b/asm/kinstone.s
@@ -892,55 +892,3 @@ _08018B8A:
 	.align 2, 0
 _08018BAC: .4byte gUnk_080FE320
 _08018BB0: .4byte 0x00000219
-
-	thumb_func_start sub_08018BB4
-sub_08018BB4: @ 0x08018BB4
-	push {r4, r5, lr}
-	sub sp, #8
-	adds r4, r0, #0
-	lsls r0, r4, #3
-	ldr r1, _08018C14 @ =gUnk_080FEAC8
-	adds r0, r0, r1
-	mov r5, sp
-	mov r1, sp
-	movs r2, #8
-	bl MemCopy
-	lsls r0, r4, #2
-	adds r0, r0, r4
-	lsls r0, r0, #2
-	ldr r1, _08018C18 @ =gUnk_080FE320
-	adds r0, r0, r1
-	ldrh r1, [r0, #8]
-	lsrs r1, r1, #4
-	movs r2, #0x3f
-	ands r1, r2
-	ldrh r0, [r0, #0xa]
-	lsrs r0, r0, #4
-	ands r0, r2
-	lsls r0, r0, #6
-	orrs r1, r0
-	strh r1, [r5, #4]
-	mov r0, sp
-	bl sub_0804B3C4
-	ldrb r0, [r5, #1]
-	bl CheckLocalFlag
-	cmp r0, #0
-	bne _08018C10
-	ldrh r3, [r5, #4]
-	ldrb r1, [r5, #6]
-	movs r0, #1
-	ands r0, r1
-	movs r2, #2
-	cmp r0, #0
-	bne _08018C08
-	movs r2, #1
-_08018C08:
-	movs r0, #0x73
-	adds r1, r3, #0
-	bl SetTileType
-_08018C10:
-	add sp, #8
-	pop {r4, r5, pc}
-	.align 2, 0
-_08018C14: .4byte gUnk_080FEAC8
-_08018C18: .4byte gUnk_080FE320
diff --git a/include/room.h b/include/room.h
index 747379b6..cb3a456f 100644
--- a/include/room.h
+++ b/include/room.h
@@ -190,15 +190,17 @@ typedef struct {
 
 typedef struct {
     u8 type;
-    u8 _1;
+    u8 localFlag;
     u8 _2;
     u8 _3;
-    u16 _4;
+    u16 tilePos;
     u8 _6;
     u8 _7;
 } TileEntity;
 extern TileEntity gSmallChests[8];
 
+extern TileEntity gUnk_080FEAC8[];
+
 typedef enum {
     NONE,
     ROOM_VISIT_MARKER,
@@ -230,7 +232,7 @@ void LoadRoomEntityList(EntityData* listPtr);
 
 bool32 LoadFixedGFX(Entity*, u32);
 void UnloadGFXSlots(Entity*);
-void sub_0804B3C4(void*);
+void sub_0804B3C4(TileEntity*);
 void sub_0804B0B0(u32 arg0, u32 arg1);
 
 void DoExitTransition(const ScreenTransitionData* data);
diff --git a/src/kinstone.c b/src/kinstone.c
index f9f4b5f8..1c42e02f 100644
--- a/src/kinstone.c
+++ b/src/kinstone.c
@@ -1,5 +1,29 @@
 #include "global.h"
 #include "room.h"
+#include "subtask.h"
+#include "common.h"
+#include "flags.h"
+
+void sub_08018BB4(int param_1) {
+    u32 layer;
+    TileEntity tile;
+    struct_080FE320* ptr;
+    u32 position;
+
+    MemCopy(gUnk_080FEAC8 + param_1, &tile, sizeof(TileEntity));
+    ptr = &gUnk_080FE320[param_1];
+    tile.tilePos = (ptr->x >> 4 & 0x3f) | (((ptr->y) >> 4 & 0x3f) << 6);
+    sub_0804B3C4(&tile);
+    if (CheckLocalFlag(tile.localFlag) == 0) {
+        position = tile.tilePos;
+        if ((tile._6 & 1) == 0) {
+            layer = 1;
+        } else {
+            layer = 2;
+        }
+        SetTileType(0x73, position, layer);
+    }
+}
 
 void CreateMinishEntrance(u32 tilePos) {
     u32 x, y;
diff --git a/src/object/objectOnPillar.c b/src/object/objectOnPillar.c
index 7f0456c8..5b5e8010 100644
--- a/src/object/objectOnPillar.c
+++ b/src/object/objectOnPillar.c
@@ -294,9 +294,9 @@ void sub_080971E0(ObjectOnPillarEntity* this) {
 bool32 sub_08097348(u32 tilePosition) {
     u32 index;
     TileEntity* tileEntity = gSmallChests;
-    for (index = 0; index < 8; index++, tileEntity++) {
-        if (tileEntity->_4 == tilePosition) {
-            return CheckLocalFlag(tileEntity->_1);
+    for (index = 0; index < ARRAY_COUNT(gSmallChests); index++, tileEntity++) {
+        if (tileEntity->tilePos == tilePosition) {
+            return CheckLocalFlag(tileEntity->localFlag);
         }
     }
     return FALSE;
diff --git a/src/playerItemUtils.c b/src/playerItemUtils.c
index 8364caf3..aa1d15a0 100644
--- a/src/playerItemUtils.c
+++ b/src/playerItemUtils.c
@@ -56,14 +56,14 @@ void sub_080A7C8C(u32 pos, u32 layer) {
     u32 found = 0;
     u32 i;
     for (i = 0; i < 8; ++i, ++t) {
-        if (*(u16*)&t->_4 == pos) {
+        if (*(u16*)&t->tilePos == pos) {
             found = 1;
             break;
         }
     }
     if ((layer >> 1) == ((u32)(t->_6 << 31) >> 31)) {
         if (found) {
-            SetLocalFlag(t->_1);
+            SetLocalFlag(t->localFlag);
             CreateItemEntity(t->_2, t->_3, 0);
         } else {
             CreateItemEntity(0x60, 0, 0);
@@ -81,7 +81,7 @@ u32 sub_080A7CFC(u32 a1) {
     TileEntity* t = GetCurrentRoomProperty(3);
     if (t != 0) {
         do {
-            if (t->_4 == a1) {
+            if (t->tilePos == a1) {
                 switch (t->type) {
                     case SIGN:
                         hint = FALSE;
@@ -95,7 +95,7 @@ u32 sub_080A7CFC(u32 a1) {
                 break;
             }
             t++;
-        } while (t->_4 != 0);
+        } while (t->tilePos != 0);
     }
     InitTileMessage(msg, hint);
 }
diff --git a/src/room.c b/src/room.c
index 92c4057a..f1051403 100644
--- a/src/room.c
+++ b/src/room.c
@@ -251,8 +251,8 @@ void* GetCurrentRoomProperty(u32 idx) {
 void sub_0804B16C(void) {
     TileEntity* tile = gSmallChests;
     do {
-        if (tile->_4 != 0 && CheckLocalFlag(tile->_1)) {
-            SetTileType(0x74, tile->_4, tile->_6 & 1 ? 2 : 1);
+        if (tile->tilePos != 0 && CheckLocalFlag(tile->localFlag)) {
+            SetTileType(0x74, tile->tilePos, tile->_6 & 1 ? 2 : 1);
         }
     } while (++tile < gSmallChests + 8);
 }
@@ -297,28 +297,28 @@ void LoadRoomTileEntities(TileEntity* list) {
 }
 
 static void LoadGrassDropTile(TileEntity* tile) {
-    MemCopy(&gAreaDroptables[tile->_1], &gRoomVars.currentAreaDroptable, 0x20);
+    MemCopy(&gAreaDroptables[tile->localFlag], &gRoomVars.currentAreaDroptable, 0x20);
 }
 
 static void LoadLocationTile(TileEntity* tile) {
-    gArea.locationIndex = tile->_1;
+    gArea.locationIndex = tile->localFlag;
     sub_08054524();
 }
 
 static void LoadRoomVisitTile(TileEntity* tile) {
-    SetLocalFlag(tile->_1);
+    SetLocalFlag(tile->localFlag);
 }
 
 static void LoadSmallChestTile(TileEntity* tile) {
     TileEntity* t = gSmallChests;
     u32 i = 0;
     for (i = 0; i < 8; ++i, ++t) {
-        if (!t->_4) {
+        if (!t->tilePos) {
             MemCopy(tile, t, sizeof(TileEntity));
-            if ((t->_6 & 1) && (gRoomControls.scroll_flags & 2) && !CheckLocalFlag(t->_1)) {
-                Entity* e = CreateObject(OBJECT_52, t->_1, 0);
+            if ((t->_6 & 1) && (gRoomControls.scroll_flags & 2) && !CheckLocalFlag(t->localFlag)) {
+                Entity* e = CreateObject(OBJECT_52, t->localFlag, 0);
                 if (e != NULL) {
-                    sub_0806F704(e, t->_4);
+                    sub_0806F704(e, t->tilePos);
                 }
             }
             return;
@@ -331,10 +331,10 @@ static void LoadBombableWallTile(TileEntity* tile) {
     if (mgr != NULL) {
         mgr->manager.type = 9;
         mgr->manager.subtype = 0x24;
-        mgr->x = tile->_4;
+        mgr->x = tile->tilePos;
         mgr->y = *(u16*)&tile->_6;
         mgr->field_0x35 = tile->_2;
-        mgr->field_0x3e = tile->_1;
+        mgr->field_0x3e = tile->localFlag;
         AppendEntityToList((Entity*)mgr, 6);
     }
 }
@@ -345,7 +345,7 @@ static void LoadDarknessTile(TileEntity* tile) {
 
 static void LoadDestructibleTile(TileEntity* tile) {
     if (CheckLocalFlag(*(u16*)&tile->_2)) {
-        SetTileType(*(u16*)&tile->_6, tile->_4, tile->_1);
+        SetTileType(*(u16*)&tile->_6, tile->tilePos, tile->localFlag);
     } else if (!gRoomVars.filler_0x1) {
         Manager* mgr;
         gRoomVars.filler_0x1 = 1;
@@ -369,6 +369,6 @@ void sub_0804B388(u32 a1, u32 a2) {
     sub_080526F8(-1);
 }
 
-void sub_0804B3C4(void* arg0) {
-    LoadSmallChestTile(arg0);
+void sub_0804B3C4(TileEntity* tile) {
+    LoadSmallChestTile(tile);
 }
diff --git a/src/roomInit.c b/src/roomInit.c
index 680b3a2d..d48595ed 100644
--- a/src/roomInit.c
+++ b/src/roomInit.c
@@ -4681,10 +4681,7 @@ u32 sub_unk3_SimonsSimulation_Main(void) {
 extern u8* gUnk_080F0D58[4];
 extern Entity* gUnk_080F0CB8[15];
 extern u8* gUnk_080F0E08[];
-extern struct {
-    u32 unk_00;
-    u32 unk_04;
-} gUnk_080F0E1C[];
+extern TileEntity gUnk_080F0E1C[];
 
 void sub_StateChange_SimonsSimulation_Main(void) {
     u32 r;
diff --git a/src/subtask.c b/src/subtask.c
index 2c847d87..4adbe0bd 100644
--- a/src/subtask.c
+++ b/src/subtask.c
@@ -90,13 +90,6 @@ extern void (*const gUnk_080FF330[])(void);
 
 void sub_08055994(void);
 
-typedef struct {
-    u8 unk_0[6];
-    u8 unk_6;
-    u8 unk_7;
-} struct_080FEAC8;
-extern struct_080FEAC8 gUnk_080FEAC8[];
-
 extern void (*const gUnk_080FF35C[])(void);
 
 extern const EntityData gUnk_080FF33C[];
@@ -676,8 +669,8 @@ void sub_08055978(void) {
 
 void sub_08055994(void) {
     u32 layer;
-    struct_080FEAC8* ptr = &gUnk_080FEAC8[gMenu.field_0x4];
-    if ((ptr->unk_6 & 1) != 0) {
+    TileEntity* ptr = &gUnk_080FEAC8[gMenu.field_0x4];
+    if ((ptr->_6 & 1) != 0) {
         layer = 2;
     } else {
         layer = 1;