diff --git a/asm/manager20.s b/asm/manager20.s
deleted file mode 100644
index 77f6e5b0..00000000
--- a/asm/manager20.s
+++ /dev/null
@@ -1,74 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_0805B7A0
-sub_0805B7A0: @ 0x0805B7A0
-	push {r4, r5, lr}
-	adds r5, r0, #0
-	ldrb r0, [r5, #0xe]
-	ldrb r1, [r5, #0xa]
-	ldrb r2, [r5, #0xb]
-	bl CreateObject
-	adds r4, r0, #0
-	cmp r4, #0
-	beq _0805B81A
-	ldrh r0, [r5, #0x3e]
-	adds r1, r4, #0
-	adds r1, #0x86
-	strh r0, [r1]
-	ldrh r0, [r5, #0x3e]
-	bl CheckFlags
-	cmp r0, #0
-	beq _0805B7EC
-	adds r0, r5, #0
-	adds r0, #0x36
-	ldrb r1, [r0]
-	adds r0, #1
-	ldrb r2, [r0]
-	movs r0, #0xf
-	ands r0, r2
-	lsls r0, r0, #8
-	orrs r1, r0
-	strh r1, [r4, #0x2e]
-	ldrh r1, [r5, #0x3c]
-	ldr r0, _0805B7E8 @ =0x00000FFF
-	ands r0, r1
-	strh r0, [r4, #0x32]
-	ldrh r0, [r5, #0x3c]
-	lsrs r0, r0, #0xc
-	b _0805B7FC
-	.align 2, 0
-_0805B7E8: .4byte 0x00000FFF
-_0805B7EC:
-	ldrh r0, [r5, #0x38]
-	strh r0, [r4, #0x2e]
-	ldrh r0, [r5, #0x3a]
-	strh r0, [r4, #0x32]
-	adds r0, r5, #0
-	adds r0, #0x37
-	ldrb r0, [r0]
-	lsrs r0, r0, #4
-_0805B7FC:
-	adds r1, r4, #0
-	adds r1, #0x38
-	strb r0, [r1]
-	ldr r0, _0805B81C @ =gRoomControls
-	ldrh r1, [r0, #6]
-	ldrh r2, [r4, #0x2e]
-	adds r1, r1, r2
-	strh r1, [r4, #0x2e]
-	ldrh r0, [r0, #8]
-	ldrh r1, [r4, #0x32]
-	adds r0, r0, r1
-	strh r0, [r4, #0x32]
-	adds r0, r5, #0
-	bl DeleteManager
-_0805B81A:
-	pop {r4, r5, pc}
-	.align 2, 0
-_0805B81C: .4byte gRoomControls
diff --git a/linker.ld b/linker.ld
index cf7d6d35..f8ce2d4b 100644
--- a/linker.ld
+++ b/linker.ld
@@ -501,7 +501,7 @@ SECTIONS {
 		asm/manager1D.o(.text);
 		asm/manager1E.o(.text);
 		asm/manager1F.o(.text);
-		asm/manager20.o(.text);
+		src/manager/manager20.o(.text);
 		asm/manager21.o(.text);
 		asm/manager22.o(.text);
 		asm/manager23.o(.text);
diff --git a/src/manager/manager20.c b/src/manager/manager20.c
new file mode 100644
index 00000000..1f989f10
--- /dev/null
+++ b/src/manager/manager20.c
@@ -0,0 +1,38 @@
+#include "global.h"
+#include "manager.h"
+#include "flags.h"
+#include "entity.h"
+#include "room.h"
+
+typedef struct {
+    Manager manager;
+    u8 unk_20[0x12];
+    u16 unk_32;
+    u8 unk_34[2];
+    u8 unk_36;
+    u8 unk_37;
+    u16 unk_38;
+    u16 unk_3a;
+    u16 unk_3c;
+    u16 unk_3e;
+} Manager20;
+
+extern void DeleteManager(Manager20*);
+
+void sub_0805B7A0(Manager20* this) {
+    Entity* tmp = CreateObject(this->manager.unk_0e, this->manager.unk_0a, this->manager.unk_0b);
+    if (!tmp) return;
+    tmp->field_0x86 = this->unk_3e;
+    if (CheckFlags(this->unk_3e)) {
+        tmp->x.HALF.HI = this->unk_36 | (this->unk_37&0xF)<<8;//r1
+        tmp->y.HALF.HI = this->unk_3c & 0xFFF;
+        tmp->collisionLayer = this->unk_3c >> 0xC;
+    } else {
+        tmp->x.HALF.HI = this->unk_38;
+        tmp->y.HALF.HI = this->unk_3a;
+        tmp->collisionLayer = this->unk_37>>4;
+    }
+    tmp->x.HALF.HI += gRoomControls.roomOriginX;
+    tmp->y.HALF.HI += gRoomControls.roomOriginY;
+    DeleteManager(this);
+}