diff --git a/asm/object/ladderHoleInBookshelf.s b/asm/object/ladderHoleInBookshelf.s
deleted file mode 100644
index 4d1cd0d1..00000000
--- a/asm/object/ladderHoleInBookshelf.s
+++ /dev/null
@@ -1,123 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-
-	thumb_func_start LadderHoleInBookshelf
-LadderHoleInBookshelf: @ 0x08093FB4
-	push {lr}
-	ldr r2, _08093FC8 @ =gUnk_081229B4
-	ldrb r1, [r0, #0xc]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_08093FC8: .4byte gUnk_081229B4
-
-	thumb_func_start sub_08093FCC
-sub_08093FCC: @ 0x08093FCC
-	push {lr}
-	movs r1, #1
-	strb r1, [r0, #0xc]
-	adds r2, r0, #0
-	adds r2, #0x38
-	movs r1, #2
-	strb r1, [r2]
-	bl UpdateSpriteForCollisionLayer
-	pop {pc}
-
-	thumb_func_start sub_08093FE0
-sub_08093FE0: @ 0x08093FE0
-	push {r4, lr}
-	adds r4, r0, #0
-	bl sub_08094064
-	cmp r0, #0
-	beq _08094062
-	adds r3, r4, #0
-	adds r3, #0x38
-	ldrb r0, [r3]
-	cmp r0, #2
-	bne _08094024
-	ldr r0, _08094020 @ =gPlayerEntity
-	ldrb r0, [r0, #0xc]
-	cmp r0, #0x1e
-	bgt _08094002
-	cmp r0, #0x1d
-	bge _08094062
-_08094002:
-	movs r0, #1
-	strb r0, [r3]
-	adds r0, r4, #0
-	bl UpdateSpriteForCollisionLayer
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	movs r0, #8
-	rsbs r0, r0, #0
-	ands r0, r1
-	movs r1, #5
-	orrs r0, r1
-	b _08094060
-	.align 2, 0
-_08094020: .4byte gPlayerEntity
-_08094024:
-	ldr r0, _0809404C @ =gPlayerEntity
-	ldrb r2, [r0, #0xc]
-	cmp r2, #0x1e
-	bgt _08094050
-	cmp r2, #0x1d
-	blt _08094050
-	movs r0, #2
-	strb r0, [r3]
-	adds r0, r4, #0
-	bl UpdateSpriteForCollisionLayer
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	movs r0, #8
-	rsbs r0, r0, #0
-	ands r0, r1
-	movs r1, #1
-	orrs r0, r1
-	b _08094060
-	.align 2, 0
-_0809404C: .4byte gPlayerEntity
-_08094050:
-	adds r2, r0, #0
-	adds r2, #0x38
-	ldrb r1, [r2]
-	movs r0, #2
-	ands r0, r1
-	cmp r0, #0
-	beq _08094062
-	movs r0, #1
-_08094060:
-	strb r0, [r2]
-_08094062:
-	pop {r4, pc}
-
-	thumb_func_start sub_08094064
-sub_08094064: @ 0x08094064
-	push {lr}
-	movs r2, #1
-	ldr r1, _08094080 @ =gPlayerEntity
-	movs r3, #0x2e
-	ldrsh r1, [r1, r3]
-	movs r3, #0x2e
-	ldrsh r0, [r0, r3]
-	subs r1, r1, r0
-	adds r1, #0x1c
-	cmp r1, #0x38
-	bls _0809407C
-	movs r2, #0
-_0809407C:
-	adds r0, r2, #0
-	pop {pc}
-	.align 2, 0
-_08094080: .4byte gPlayerEntity
diff --git a/data/const/object/ladderHoleInBookshelf.s b/data/const/object/ladderHoleInBookshelf.s
deleted file mode 100644
index 0b74a105..00000000
--- a/data/const/object/ladderHoleInBookshelf.s
+++ /dev/null
@@ -1,9 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-    .align 2
-
-gUnk_081229B4:: @ 081229B4
-	.4byte sub_08093FCC
-	.4byte sub_08093FE0
diff --git a/linker.ld b/linker.ld
index 58b7c954..5ed3400b 100644
--- a/linker.ld
+++ b/linker.ld
@@ -747,7 +747,7 @@ SECTIONS {
         src/object/giantTwig.o(.text);
         asm/object/object63.o(.text);
         asm/object/object64.o(.text);
-        asm/object/ladderHoleInBookshelf.o(.text);
+        src/object/ladderHoleInBookshelf.o(.text);
         asm/object/object66.o(.text);
         asm/object/object67.o(.text);
         src/object/object68.o(.text);
@@ -1492,7 +1492,7 @@ SECTIONS {
         data/const/object/object63.o(.rodata);
         data/const/object/object64.o(.rodata);
         data/animations/object/object64.o(.rodata);
-        data/const/object/ladderHoleInBookshelf.o(.rodata);
+        src/object/ladderHoleInBookshelf.o(.rodata);
         data/const/object/object67.o(.rodata);
         src/object/object68.o(.rodata);
         src/object/object6A.o(.rodata);
diff --git a/src/object/ladderHoleInBookshelf.c b/src/object/ladderHoleInBookshelf.c
new file mode 100644
index 00000000..4e3cb3fb
--- /dev/null
+++ b/src/object/ladderHoleInBookshelf.c
@@ -0,0 +1,60 @@
+#include "entity.h"
+#include "player.h"
+
+void sub_08093FCC(Entity* this);
+void sub_08093FE0(Entity* this);
+bool32 sub_08094064(Entity* this);
+
+void LadderHoleInBookshelf(Entity* this) {
+    static void (*const actionFuncs[])(Entity*) = {
+        sub_08093FCC,
+        sub_08093FE0,
+    };
+
+    actionFuncs[this->action](this);
+}
+
+void sub_08093FCC(Entity* this) {
+    this->action = 1;
+    this->collisionLayer = 2;
+    UpdateSpriteForCollisionLayer(this);
+}
+
+void sub_08093FE0(Entity* this) {
+    if (sub_08094064(this)) {
+        if (this->collisionLayer == 2) {
+            switch (gPlayerEntity.action) {
+                case 0x1d:
+                case 0x1e:
+                    return;
+            }
+            this->collisionLayer = 1;
+            UpdateSpriteForCollisionLayer(this);
+            this->spritePriority.b0 = 5;
+        } else {
+            switch (gPlayerEntity.action) {
+                case 0x1d:
+                case 0x1e:
+                    this->collisionLayer = 2;
+                    UpdateSpriteForCollisionLayer(this);
+                    this->spritePriority.b0 = 1;
+                    break;
+                default:
+                    if ((gPlayerEntity.collisionLayer & 2) == 0) {
+                        break;
+                    }
+                    gPlayerEntity.collisionLayer = 1;
+                    break;
+            }
+        }
+    }
+}
+
+bool32 sub_08094064(Entity* this) {
+    bool32 rv = 1;
+    if (gPlayerEntity.x.HALF.HI - this->x.HALF.HI + 0x1cU >= 0x39) {
+        rv = 0;
+    }
+
+    return rv;
+}