diff --git a/asm/object/object4B.s b/asm/object/object4B.s
deleted file mode 100644
index e9c65140..00000000
--- a/asm/object/object4B.s
+++ /dev/null
@@ -1,267 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-
-	thumb_func_start Object4B
-Object4B: @ 0x0808F77C
-	push {lr}
-	ldr r2, _0808F790 @ =gUnk_08121EB8
-	ldrb r1, [r0, #0xc]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_0808F790: .4byte gUnk_08121EB8
-
-	thumb_func_start sub_0808F794
-sub_0808F794: @ 0x0808F794
-	push {lr}
-	movs r1, #1
-	strb r1, [r0, #0xc]
-	movs r1, #0x3c
-	strb r1, [r0, #0xe]
-	movs r1, #0
-	bl InitializeAnimation
-	pop {pc}
-	.align 2, 0
-
-	thumb_func_start sub_0808F7A8
-sub_0808F7A8: @ 0x0808F7A8
-	push {lr}
-	adds r2, r0, #0
-	ldrb r0, [r2, #0xe]
-	subs r0, #1
-	strb r0, [r2, #0xe]
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0808F7D0
-	movs r0, #0x78
-	strb r0, [r2, #0xe]
-	ldrb r0, [r2, #0xc]
-	adds r0, #1
-	strb r0, [r2, #0xc]
-	ldrb r1, [r2, #0x18]
-	movs r0, #4
-	rsbs r0, r0, #0
-	ands r0, r1
-	movs r1, #1
-	orrs r0, r1
-	strb r0, [r2, #0x18]
-_0808F7D0:
-	pop {pc}
-	.align 2, 0
-
-	thumb_func_start sub_0808F7D4
-sub_0808F7D4: @ 0x0808F7D4
-	push {r4, lr}
-	adds r4, r0, #0
-	bl GetNextFrame
-	adds r0, r4, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _0808F80A
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	movs r0, #0x39
-	rsbs r0, r0, #0
-	ands r0, r1
-	movs r1, #0x18
-	orrs r0, r1
-	strb r0, [r2]
-	adds r0, r4, #0
-	movs r1, #2
-	bl InitializeAnimation
-_0808F80A:
-	pop {r4, pc}
-
-	thumb_func_start sub_0808F80C
-sub_0808F80C: @ 0x0808F80C
-	push {r4, lr}
-	adds r4, r0, #0
-	bl GetNextFrame
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	strb r0, [r4, #0xe]
-	lsls r0, r0, #0x18
-	lsrs r1, r0, #0x18
-	cmp r1, #0
-	bne _0808F850
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-	strb r1, [r4, #0x15]
-	movs r2, #0
-	movs r0, #0x80
-	lsls r0, r0, #1
-	strh r0, [r4, #0x24]
-	movs r0, #0x80
-	lsls r0, r0, #0xa
-	str r0, [r4, #0x20]
-	ldrb r1, [r4, #0x1b]
-	movs r0, #0x3f
-	ands r0, r1
-	strb r0, [r4, #0x1b]
-	strb r2, [r4, #0xe]
-	adds r0, r4, #0
-	movs r1, #3
-	bl InitializeAnimation
-	ldr r0, _0808F854 @ =0x0000012B
-	bl SoundReq
-_0808F850:
-	pop {r4, pc}
-	.align 2, 0
-_0808F854: .4byte 0x0000012B
-
-	thumb_func_start sub_0808F858
-sub_0808F858: @ 0x0808F858
-	push {r4, lr}
-	adds r4, r0, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x10
-	ands r0, r1
-	cmp r0, #0
-	beq _0808F884
-	adds r0, r4, #0
-	bl LinearMoveUpdate
-	movs r1, #0x80
-	lsls r1, r1, #6
-	adds r0, r4, #0
-	bl GravityUpdate
-	cmp r0, #0
-	bne _0808F88A
-	adds r0, r4, #0
-	bl GetNextFrame
-	b _0808F88A
-_0808F884:
-	adds r0, r4, #0
-	bl GetNextFrame
-_0808F88A:
-	movs r1, #0x32
-	ldrsh r0, [r4, r1]
-	ldr r1, _0808F8C4 @ =gRoomControls
-	ldrh r2, [r1, #8]
-	subs r0, r0, r2
-	movs r1, #0x8c
-	lsls r1, r1, #2
-	cmp r0, r1
-	bgt _0808F8C8
-	adds r0, r2, r1
-	strh r0, [r4, #0x32]
-	adds r0, r4, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _0808F8EA
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-	movs r0, #0x78
-	strb r0, [r4, #0xe]
-	adds r0, r4, #0
-	movs r1, #2
-	bl InitializeAnimation
-	b _0808F8EA
-	.align 2, 0
-_0808F8C4: .4byte gRoomControls
-_0808F8C8:
-	adds r0, r4, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _0808F8EA
-	movs r0, #0x80
-	lsls r0, r0, #0xa
-	str r0, [r4, #0x20]
-	adds r0, r4, #0
-	movs r1, #3
-	bl InitializeAnimation
-	ldr r0, _0808F8EC @ =0x0000012B
-	bl SoundReq
-_0808F8EA:
-	pop {r4, pc}
-	.align 2, 0
-_0808F8EC: .4byte 0x0000012B
-
-	thumb_func_start sub_0808F8F0
-sub_0808F8F0: @ 0x0808F8F0
-	push {r4, lr}
-	adds r4, r0, #0
-	bl GetNextFrame
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	strb r0, [r4, #0xe]
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0808F912
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-	adds r0, r4, #0
-	movs r1, #5
-	bl InitializeAnimation
-_0808F912:
-	pop {r4, pc}
-
-	thumb_func_start sub_0808F914
-sub_0808F914: @ 0x0808F914
-	push {r4, lr}
-	adds r4, r0, #0
-	bl GetNextFrame
-	adds r0, r4, #0
-	adds r0, #0x5a
-	ldrb r1, [r0]
-	movs r0, #0x80
-	ands r0, r1
-	cmp r0, #0
-	beq _0808F93C
-	ldrb r0, [r4, #0xc]
-	adds r0, #1
-	strb r0, [r4, #0xc]
-	movs r0, #0x3c
-	strb r0, [r4, #0xe]
-	adds r0, r4, #0
-	movs r1, #1
-	bl InitializeAnimation
-_0808F93C:
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_0808F940
-sub_0808F940: @ 0x0808F940
-	push {r4, lr}
-	adds r4, r0, #0
-	bl GetNextFrame
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	strb r0, [r4, #0xe]
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0808F960
-	ldr r1, _0808F964 @ =gMenu
-	ldrb r0, [r1, #6]
-	adds r0, #1
-	strb r0, [r1, #6]
-	bl DeleteThisEntity
-_0808F960:
-	pop {r4, pc}
-	.align 2, 0
-_0808F964: .4byte gMenu
diff --git a/data/const/object/object4B.s b/data/const/object/object4B.s
deleted file mode 100644
index a0055399..00000000
--- a/data/const/object/object4B.s
+++ /dev/null
@@ -1,15 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-    .align 2
-
-gUnk_08121EB8:: @ 08121EB8
-	.4byte sub_0808F794
-	.4byte sub_0808F7A8
-	.4byte sub_0808F7D4
-	.4byte sub_0808F80C
-	.4byte sub_0808F858
-	.4byte sub_0808F8F0
-	.4byte sub_0808F914
-	.4byte sub_0808F940
diff --git a/linker.ld b/linker.ld
index 51c21733..8dcfcf60 100644
--- a/linker.ld
+++ b/linker.ld
@@ -698,7 +698,7 @@ SECTIONS {
         src/object/fileScreenObjects.o(.text);
         src/object/object49.o(.text);
         src/object/backgroundCloud.o(.text);
-        asm/object/object4B.o(.text);
+        src/object/object4B.o(.text);
         src/object/pushableFurniture.o(.text);
         src/object/furniture.o(.text);
         src/object/minishSizedEntrance.o(.text);
@@ -1435,7 +1435,7 @@ SECTIONS {
         data/animations/object/fileScreenObjects.o(.rodata);
         data/const/object/object49.o(.rodata);
         data/const/object/backgroundCloud.o(.rodata);
-        data/const/object/object4B.o(.rodata);
+        src/object/object4B.o(.rodata);
         src/object/pushableFurniture.o(.rodata);
         data/const/object/furniture.o(.rodata);
         data/animations/object/furniture.o(.rodata);
diff --git a/src/object/object4B.c b/src/object/object4B.c
new file mode 100644
index 00000000..9181944f
--- /dev/null
+++ b/src/object/object4B.c
@@ -0,0 +1,117 @@
+/**
+ * @file object4B.c
+ * @ingroup Objects
+ *
+ * @brief Object4B object
+ */
+
+#define NENT_DEPRECATED
+#include "global.h"
+#include "object.h"
+#include "functions.h"
+#include "menu.h"
+
+typedef struct {
+    /*0x00*/ Entity base;
+} Object4BEntity;
+
+void Object4B_Init(Object4BEntity*);
+void Object4B_Action1(Object4BEntity*);
+void Object4B_Action2(Object4BEntity*);
+void Object4B_Action3(Object4BEntity*);
+void Object4B_Action4(Object4BEntity*);
+void Object4B_Action5(Object4BEntity*);
+void Object4B_Action6(Object4BEntity*);
+void Object4B_Action7(Object4BEntity*);
+
+void Object4B(Object4BEntity* this) {
+    static void (*const Object4B_Actions[])(Object4BEntity*) = {
+        Object4B_Init, Object4B_Action1, Object4B_Action2, Object4B_Action3, Object4B_Action4, Object4B_Action5, Object4B_Action6, Object4B_Action7,
+    };
+    Object4B_Actions[super->action](this);
+}
+
+void Object4B_Init(Object4BEntity* this) {
+    super->action = 1;
+    super->actionDelay = 0x3c;
+    InitializeAnimation(super, 0);
+}
+
+void Object4B_Action1(Object4BEntity* this) {
+    if (--super->actionDelay == 0) {
+        super->actionDelay = 0x78;
+        super->action++;
+        super->spriteSettings.draw = 1;
+    }
+}
+
+void Object4B_Action2(Object4BEntity* this) {
+    GetNextFrame(super);
+    if ((super->frame & 0x80) != 0) {
+        super->action++;
+        super->spritePriority.b1 = 3;
+        InitializeAnimation(super, 2);
+    }
+}
+
+void Object4B_Action3(Object4BEntity* this) {
+    GetNextFrame(super);
+    if (--super->actionDelay == 0) {
+        super->action++;
+        super->direction = 0;
+        super->speed = 0x100;
+        super->zVelocity = 0x20000;
+        super->spriteOrientation.flipY = 0;
+        super->actionDelay = 0;
+        InitializeAnimation(super, 3);
+        SoundReq(SFX_12B);
+    }
+}
+
+void Object4B_Action4(Object4BEntity* this) {
+    if ((super->frame & 0x10) != 0) {
+        LinearMoveUpdate(super);
+        if (GravityUpdate(super, 0x2000) == 0) {
+            GetNextFrame(super);
+        }
+    } else {
+        GetNextFrame(super);
+    }
+    if ((super->y.HALF.HI - gRoomControls.origin_y) < 0x231) {
+        super->y.HALF.HI = gRoomControls.origin_y + 0x230;
+        if ((super->frame & 0x80) != 0) {
+            super->action++;
+            super->actionDelay = 0x78;
+            InitializeAnimation(super, 2);
+        }
+    } else if ((super->frame & 0x80) != 0) {
+        super->zVelocity = 0x20000;
+        InitializeAnimation(super, 3);
+        SoundReq(SFX_12B);
+    }
+}
+
+void Object4B_Action5(Object4BEntity* this) {
+    GetNextFrame(super);
+    if (--super->actionDelay == 0) {
+        super->action++;
+        InitializeAnimation(super, 5);
+    }
+}
+
+void Object4B_Action6(Object4BEntity* this) {
+    GetNextFrame(super);
+    if ((super->frame & 0x80) != 0) {
+        super->action++;
+        super->actionDelay = 0x3c;
+        InitializeAnimation(super, 1);
+    }
+}
+
+void Object4B_Action7(Object4BEntity* this) {
+    GetNextFrame(super);
+    if (--super->actionDelay == 0) {
+        gMenu.overlayType++;
+        DeleteThisEntity();
+    }
+}