diff --git a/asm/armos.s b/asm/armos.s
index 29b4f36b..10ead871 100644
--- a/asm/armos.s
+++ b/asm/armos.s
@@ -1013,7 +1013,7 @@ _0803088E:
 	orrs r0, r1
 	strb r0, [r2]
 	ldr r0, [r5, #0x7c]
-	bl sub_08080840
+	bl DoExitTransition
 	ldr r0, _08030938 @ =gUnk_030010A0
 	adds r1, r5, #0
 	adds r1, #0x80
diff --git a/asm/code_08056418.s b/asm/code_08056418.s
index 9535ec10..89b58c35 100644
--- a/asm/code_08056418.s
+++ b/asm/code_08056418.s
@@ -3266,7 +3266,7 @@ _08057D18:
 	bne _08057D3A
 	ldrb r0, [r4, #6]
 	bl sub_0804B128
-	bl sub_08080840
+	bl DoExitTransition
 _08057D3A:
 	adds r4, #8
 	ldrh r0, [r4]
@@ -15569,7 +15569,7 @@ sub_0805DC70: @ 0x0805DC70
 	push {lr}
 	bl sub_0805E5A8
 	ldr r0, _0805DC80 @ =gUnk_0813AC48
-	bl sub_08080840
+	bl DoExitTransition
 	pop {pc}
 	.align 2, 0
 _0805DC80: .4byte gUnk_0813AC48
diff --git a/asm/code_08070698.s b/asm/code_08070698.s
index cfe246e3..924dd878 100644
--- a/asm/code_08070698.s
+++ b/asm/code_08070698.s
@@ -2205,7 +2205,7 @@ _080717B0:
 	cmp r0, #6
 	bne _080717C0
 	ldr r0, _080717BC @ =gUnk_0813AB58
-	bl sub_08080840
+	bl DoExitTransition
 	b _080717CA
 	.align 2, 0
 _080717BC: .4byte gUnk_0813AB58
diff --git a/asm/code_080732D0.s b/asm/code_080732D0.s
index 0492f487..9bd2c3e9 100644
--- a/asm/code_080732D0.s
+++ b/asm/code_080732D0.s
@@ -806,7 +806,7 @@ _080738A2:
 	lsls r0, r0, #2
 	ldr r1, _080738E8 @ =gUnk_0813AD88
 	adds r0, r0, r1
-	bl sub_08080840
+	bl DoExitTransition
 	b _080738F0
 	.align 2, 0
 _080738DC: .4byte gUnk_030010A0
diff --git a/asm/code_08077B98.s b/asm/code_08077B98.s
index 99a5bc34..335ad265 100644
--- a/asm/code_08077B98.s
+++ b/asm/code_08077B98.s
@@ -7386,7 +7386,7 @@ sub_0807B2B8: @ 0x0807B2B8
 	lsls r0, r0, #2
 	ldr r1, _0807B2F4 @ =gUnk_0813AD88
 	adds r0, r0, r1
-	bl sub_08080840
+	bl DoExitTransition
 _0807B2EC:
 	pop {r4, pc}
 	.align 2, 0
diff --git a/asm/code_0807CC3C.s b/asm/code_0807CC3C.s
index 07b9dc4a..5d579f3e 100644
--- a/asm/code_0807CC3C.s
+++ b/asm/code_0807CC3C.s
@@ -7988,7 +7988,7 @@ _080806E2:
 	cmp r0, #0
 	beq _08080720
 	adds r0, r5, #0
-	bl sub_08080840
+	bl DoExitTransition
 	movs r0, #1
 	b _0808072A
 	.align 2, 0
@@ -8161,8 +8161,8 @@ _0808083C:
 _0808083E:
 	pop {r4, r5, pc}
 
-	thumb_func_start sub_08080840
-sub_08080840: @ 0x08080840
+	thumb_func_start DoExitTransition
+DoExitTransition: @ 0x08080840
 	push {r4, lr}
 	adds r4, r0, #0
 	ldr r0, _0808085C @ =gUnk_030010A0
diff --git a/asm/code_080A5574.s b/asm/code_080A5574.s
index f53c9429..b2099ae3 100644
--- a/asm/code_080A5574.s
+++ b/asm/code_080A5574.s
@@ -3643,7 +3643,7 @@ sub_080A71F4: @ 0x080A71F4
 	push {lr}
 	cmp r0, #0
 	beq _080A71FE
-	bl sub_08080840
+	bl DoExitTransition
 _080A71FE:
 	bl sub_0805E89C
 	bl sub_0805E974
diff --git a/asm/mazaalHead.s b/asm/mazaalHead.s
index ab086909..7210acb9 100644
--- a/asm/mazaalHead.s
+++ b/asm/mazaalHead.s
@@ -1837,7 +1837,7 @@ sub_08034C00: @ 0x08034C00
 	cmp r0, #0x3c
 	bls _08034C54
 	ldr r0, _08034C50 @ =gUnk_080CED88
-	bl sub_08080840
+	bl DoExitTransition
 	b _08034C5A
 	.align 2, 0
 _08034C44: .4byte gLinkState
@@ -1846,7 +1846,7 @@ _08034C4C: .4byte gUnk_030010A0
 _08034C50: .4byte gUnk_080CED88
 _08034C54:
 	ldr r0, _08034C5C @ =gUnk_080CED9C
-	bl sub_08080840
+	bl DoExitTransition
 _08034C5A:
 	pop {r4, pc}
 	.align 2, 0
diff --git a/asm/mazaalMacro.s b/asm/mazaalMacro.s
index 296d6752..1951c225 100644
--- a/asm/mazaalMacro.s
+++ b/asm/mazaalMacro.s
@@ -400,7 +400,7 @@ sub_08034F58: @ 0x08034F58
 	push {r4, lr}
 	adds r4, r0, #0
 	ldr r0, _08034F6C @ =gUnk_0813ABA8
-	bl sub_08080840
+	bl DoExitTransition
 	adds r0, r4, #0
 	bl DeleteEntity
 	pop {r4, pc}
diff --git a/asm/minishSizedEntrance.s b/asm/minishSizedEntrance.s
index 6604eabd..c6c4a2dd 100644
--- a/asm/minishSizedEntrance.s
+++ b/asm/minishSizedEntrance.s
@@ -100,7 +100,7 @@ _08090F1C:
 	beq _08090F62
 	ldrb r0, [r4, #0xe]
 	bl sub_0804B128
-	bl sub_08080840
+	bl DoExitTransition
 _08090F62:
 	pop {r4, r5, r6, pc}
 	.align 2, 0
diff --git a/asm/picolyteBottles.s b/asm/picolyteBottles.s
index 2f90341a..dacc72a0 100644
--- a/asm/picolyteBottles.s
+++ b/asm/picolyteBottles.s
@@ -420,7 +420,7 @@ sub_0806E1E0: @ 0x0806E1E0
 sub_0806E1FC: @ 0x0806E1FC
 	push {lr}
 	ldr r0, _0806E208 @ =gUnk_0813AD4C
-	bl sub_08080840
+	bl DoExitTransition
 	pop {pc}
 	.align 2, 0
 _0806E208: .4byte gUnk_0813AD4C
diff --git a/asm/simon.s b/asm/simon.s
deleted file mode 100644
index fb20b96b..00000000
--- a/asm/simon.s
+++ /dev/null
@@ -1,110 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_0806C204
-sub_0806C204: @ 0x0806C204
-	push {lr}
-	adds r1, r0, #0
-	ldrb r0, [r1, #0xc]
-	cmp r0, #0
-	bne _0806C21A
-	adds r0, #1
-	strb r0, [r1, #0xc]
-	adds r0, r1, #0
-	bl sub_0807DD50
-	b _0806C222
-_0806C21A:
-	adds r0, r1, #0
-	movs r1, #0
-	bl sub_0807DD94
-_0806C222:
-	pop {pc}
-
-	thumb_func_start sub_0806C224
-sub_0806C224: @ 0x0806C224
-	push {lr}
-	ldr r0, _0806C234 @ =gUnk_0813AD60
-	bl sub_08080840
-	ldr r1, _0806C238 @ =gUnk_030010A0
-	movs r0, #6
-	strb r0, [r1, #9]
-	pop {pc}
-	.align 2, 0
-_0806C234: .4byte gUnk_0813AD60
-_0806C238: .4byte gUnk_030010A0
-
-	thumb_func_start sub_0806C23C
-sub_0806C23C: @ 0x0806C23C
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	movs r1, #0xf
-	movs r2, #0x43
-	movs r3, #0
-	bl CreateObjectWithParent
-	movs r0, #0x2e
-	ldrsh r1, [r4, r0]
-	ldr r2, _0806C27C @ =gRoomControls
-	ldrh r0, [r2, #6]
-	subs r1, r1, r0
-	asrs r1, r1, #4
-	movs r3, #0x3f
-	ands r1, r3
-	movs r5, #0x32
-	ldrsh r0, [r4, r5]
-	ldrh r2, [r2, #8]
-	subs r0, r0, r2
-	asrs r0, r0, #4
-	ands r0, r3
-	lsls r0, r0, #6
-	orrs r1, r0
-	adds r4, #0x38
-	ldrb r2, [r4]
-	movs r0, #0x73
-	bl SetTileType
-	movs r0, #0x73
-	bl PlaySFX
-	pop {r4, r5, pc}
-	.align 2, 0
-_0806C27C: .4byte gRoomControls
-
-	thumb_func_start sub_0806C280
-sub_0806C280: @ 0x0806C280
-	push {lr}
-	movs r0, #0x50
-	bl SetGlobalFlag
-	ldr r0, _0806C298 @ =gUnk_0813AD74
-	bl sub_08080840
-	ldr r1, _0806C29C @ =gUnk_030010A0
-	movs r0, #6
-	strb r0, [r1, #9]
-	pop {pc}
-	.align 2, 0
-_0806C298: .4byte gUnk_0813AD74
-_0806C29C: .4byte gUnk_030010A0
-
-	thumb_func_start sub_0806C2A0
-sub_0806C2A0: @ 0x0806C2A0
-	push {lr}
-	ldr r0, [r1, #4]
-	cmp r0, #0
-	beq _0806C2AE
-	cmp r0, #1
-	beq _0806C2B8
-	b _0806C2C0
-_0806C2AE:
-	movs r0, #0xd
-	movs r1, #4
-	bl DoFade
-	b _0806C2C0
-_0806C2B8:
-	movs r0, #0xc
-	movs r1, #4
-	bl DoFade
-_0806C2C0:
-	pop {pc}
-	.align 2, 0
diff --git a/asm/vaatiArm.s b/asm/vaatiArm.s
index 4e025586..98f138e5 100644
--- a/asm/vaatiArm.s
+++ b/asm/vaatiArm.s
@@ -3331,7 +3331,7 @@ sub_08043DB0: @ 0x08043DB0
 	cmp r0, #0
 	beq _08043EAC
 	ldr r0, _08043E50 @ =gUnk_080D13EC
-	bl sub_08080840
+	bl DoExitTransition
 	ldr r4, _08043E54 @ =gUnk_030010A0
 	adds r0, r4, #0
 	adds r0, #0x39
diff --git a/asm/vaatiProjectile.s b/asm/vaatiProjectile.s
index 46cd8c40..f7e0c4b3 100644
--- a/asm/vaatiProjectile.s
+++ b/asm/vaatiProjectile.s
@@ -436,7 +436,7 @@ sub_0803E398: @ 0x0803E398
 	bgt _0803E3C8
 	bl sub_0805E5A8
 	ldr r0, _0803E3D0 @ =gUnk_0813AB94
-	bl sub_08080840
+	bl DoExitTransition
 _0803E3C8:
 	pop {r4, pc}
 	.align 2, 0
diff --git a/asm/wallMaster.s b/asm/wallMaster.s
index 8afe932c..2beda836 100644
--- a/asm/wallMaster.s
+++ b/asm/wallMaster.s
@@ -447,7 +447,7 @@ sub_0802A734: @ 0x0802A734
 	lsls r0, r0, #2
 	adds r0, r0, r1
 	ldr r0, [r0]
-	bl sub_08080840
+	bl DoExitTransition
 	b _0802A780
 	.align 2, 0
 _0802A760: .4byte gUnk_0813AB1C
diff --git a/asm/wallMaster2.s b/asm/wallMaster2.s
index bf87a4e4..82043e5e 100644
--- a/asm/wallMaster2.s
+++ b/asm/wallMaster2.s
@@ -370,7 +370,7 @@ sub_0802CEF4: @ 0x0802CEF4
 	lsls r0, r0, #2
 	adds r0, r0, r1
 	ldr r0, [r0]
-	bl sub_08080840
+	bl DoExitTransition
 	b _0802CF5A
 	.align 2, 0
 _0802CF20: .4byte gUnk_0813AB1C
diff --git a/asm/windTribeTeleporter.s b/asm/windTribeTeleporter.s
index d0b3904b..ddae0a9f 100644
--- a/asm/windTribeTeleporter.s
+++ b/asm/windTribeTeleporter.s
@@ -208,7 +208,7 @@ _080A10A2:
 	lsls r0, r0, #2
 	ldr r1, _080A10B8 @ =gUnk_0813ADEC
 	adds r0, r0, r1
-	bl sub_08080840
+	bl DoExitTransition
 	b _080A10D4
 	.align 2, 0
 _080A10B4: .4byte gRoomControls
diff --git a/include/entity.h b/include/entity.h
index ba301aff..69107ed6 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -1,8 +1,8 @@
-#include "global.h"
-
 #ifndef ENTITY_H
 #define ENTITY_H
 
+#include "global.h"
+
 typedef struct {
     void* entity1;
     void* entity2;
@@ -145,4 +145,6 @@ typedef struct Entity {
 
 } Entity;
 
+#define COORD_TO_TILE(entity) ((((entity->x.HALF.HI - gRoomControls.roomOriginX) >> 4) & 0x3fU) | (((entity->y.HALF.HI - gRoomControls.roomOriginY) >> 4) & 0x3fU) << 6)
+
 #endif
diff --git a/linker.ld b/linker.ld
index 368c9de5..f6bf3457 100644
--- a/linker.ld
+++ b/linker.ld
@@ -533,7 +533,7 @@ SECTIONS {
 		asm/drLeft.o(.text);
 		asm/kingGustaf.o(.text);
 		asm/gina.o(.text);
-		asm/simon.o(.text);
+		src/simon.o(.text);
 		asm/anju.o(.text);
 		asm/mama.o(.text);
 		src/emma.o(.text);
diff --git a/src/emma.c b/src/emma.c
index a65a67e4..2776b7e9 100644
--- a/src/emma.c
+++ b/src/emma.c
@@ -8,7 +8,7 @@ extern u32 gUnk_0813AD38;
 extern void sub_0805E3A0(Entity*, u32);
 extern void sub_0807DD50(Entity*);
 extern void sub_0807DD94(Entity*, u32);
-extern void sub_08080840(u32*);
+extern void DoExitTransition(u32*);
 
 void sub_0806C550(Entity* param_1)
 
@@ -26,20 +26,20 @@ void sub_0806C550(Entity* param_1)
 void sub_0806C578(void)
 
 {
-    sub_08080840(&gUnk_0813AD10);
+    DoExitTransition(&gUnk_0813AD10);
     return;
 }
 
 void sub_0806C588(void)
 
 {
-    sub_08080840(&gUnk_0813AD24);
+    DoExitTransition(&gUnk_0813AD24);
     return;
 }
 
 void FUN_0806c598(void)
 
 {
-    sub_08080840(&gUnk_0813AD38);
+    DoExitTransition(&gUnk_0813AD38);
     return;
 }
diff --git a/src/room.c b/src/room.c
index 8149cc1f..3ba2096e 100644
--- a/src/room.c
+++ b/src/room.c
@@ -8,13 +8,13 @@ extern u32 gUnk_0200B650;
 extern u32 gUnk_02025EB0;
 extern u8 gUnk_030010A0[10];
 
-extern void sub_08080840(Entity*);
+extern void DoExitTransition(Entity*);
 extern void sub_080809D4();
 
 void sub_0808091C(Entity* param_1, u32 param_2)
 
 {
-    sub_08080840(param_1);
+    DoExitTransition(param_1);
     gUnk_030010A0[9] = param_2;
     return;
 }
diff --git a/src/simon.c b/src/simon.c
new file mode 100644
index 00000000..1e56d6bc
--- /dev/null
+++ b/src/simon.c
@@ -0,0 +1,68 @@
+#include "global.h"
+#include "entity.h"
+#include "functions.h"
+#include "room.h"
+#include "flags.h"
+
+typedef struct {
+    u8 filler[9];
+    u8 unk;
+} struct_030010A0;
+
+typedef struct {
+ u8 filler[4];
+ u32 unk;
+} struct_0806C2A0;
+
+extern void DoExitTransition(void *);
+extern void SetTileType(u32, u32, u32);
+extern void CreateObjectWithParent(Entity*, u32, u32, u32);
+extern void DoExitTransition(void *);
+extern void DoFade(u32, u32);
+
+extern void gUnk_0813AD60;
+extern void gUnk_0813AD74;
+extern struct_030010A0 gUnk_030010A0;
+
+void Simon(Entity *this)
+{
+  if (this->action == 0) {
+    this->action++;
+    sub_0807DD50(this);
+  }
+  else {
+    sub_0807DD94(this, 0);
+  }
+}
+
+void sub_0806C224(void)
+{
+  DoExitTransition(&gUnk_0813AD60);
+  gUnk_030010A0.unk = 6;
+}
+
+void Simon_CreateChest(Entity *this)
+{
+  CreateObjectWithParent(this,0xf,0x43,0);
+  SetTileType(0x73, COORD_TO_TILE(this), this->collisionLayer);
+  PlaySFX(0x73);
+}
+
+void sub_0806C280(void)
+{
+  SetGlobalFlag(0x50);
+  DoExitTransition(&gUnk_0813AD74);
+  gUnk_030010A0.unk = 6;
+}
+
+void sub_0806C2A0(u32 *param_1,struct_0806C2A0 *param_2)
+{
+    switch (param_2->unk) {
+        case 0:
+            DoFade(0xd, 4);
+            break;
+        case 1:
+            DoFade(0xc, 4);
+            break;
+    }
+}
\ No newline at end of file
diff --git a/src/tmc.code-workspace b/src/tmc.code-workspace
index 2a0ed79b..e061a281 100644
--- a/src/tmc.code-workspace
+++ b/src/tmc.code-workspace
@@ -3,5 +3,10 @@
 		{
 			"path": ".."
 		}
-	]
+	],
+	"settings": {
+		"files.associations": {
+			"algorithm": "cpp"
+		}
+	}
 }
\ No newline at end of file