diff --git a/asm/include/unk_0202C858.inc b/asm/include/unk_0202C858.inc
deleted file mode 100644
index ffb0f3b61a..0000000000
--- a/asm/include/unk_0202C858.inc
+++ /dev/null
@@ -1,7 +0,0 @@
-.public GF_AssertFail
-.public sub_020245BC
-.public sub_02025C48
-.public sub_02025C84
-.public sub_0202C918
-.public sub_0202C994
-.public MIi_CpuClear32
diff --git a/asm/unk_0202C858.s b/asm/unk_0202C858.s
deleted file mode 100644
index 1a4a7391dd..0000000000
--- a/asm/unk_0202C858.s
+++ /dev/null
@@ -1,254 +0,0 @@
-	.include "macros/function.inc"
-	.include "include/unk_0202C858.inc"
-
-	
-
-	.text
-
-
-	thumb_func_start sub_0202C858
-sub_0202C858: ; 0x0202C858
-	ldr r0, _0202C85C ; =0x00000FF8
-	bx lr
-	; .align 2, 0
-_0202C85C: .word 0x00000FF8
-	thumb_func_end sub_0202C858
-
-	thumb_func_start sub_0202C860
-sub_0202C860: ; 0x0202C860
-	push {r3, lr}
-	ldr r2, _0202C874 ; =0x00000FF8
-	add r1, r0, #0
-	mov r0, #0
-	bl MIi_CpuClear32
-	mov r0, #0x1e
-	bl sub_02025C84
-	pop {r3, pc}
-	; .align 2, 0
-_0202C874: .word 0x00000FF8
-	thumb_func_end sub_0202C860
-
-	thumb_func_start sub_0202C878
-sub_0202C878: ; 0x0202C878
-	push {r4, lr}
-	add r4, r0, #0
-	mov r0, #0x1e
-	bl sub_02025C48
-	add r0, r4, #0
-	mov r1, #0x1e
-	bl sub_020245BC
-	pop {r4, pc}
-	thumb_func_end sub_0202C878
-
-	thumb_func_start sub_0202C88C
-sub_0202C88C: ; 0x0202C88C
-	push {r4, r5, r6, lr}
-	add r6, r0, #0
-	mov r0, #1
-	add r5, r1, #0
-	lsl r0, r0, #8
-	add r4, r2, #0
-	cmp r5, r0
-	blt _0202C8A0
-	bl GF_AssertFail
-_0202C8A0:
-	cmp r4, #0x40
-	blt _0202C8A8
-	bl GF_AssertFail
-_0202C8A8:
-	strb r5, [r6, #5]
-	add r0, r6, #0
-	add r1, r5, #0
-	add r2, r4, #0
-	mov r3, #3
-	strb r4, [r6, #6]
-	bl sub_0202C918
-	mov r0, #0x1e
-	bl sub_02025C84
-	pop {r4, r5, r6, pc}
-	thumb_func_end sub_0202C88C
-
-	thumb_func_start sub_0202C8C0
-sub_0202C8C0: ; 0x0202C8C0
-	ldrb r0, [r0, #5]
-	bx lr
-	thumb_func_end sub_0202C8C0
-
-	thumb_func_start sub_0202C8C4
-sub_0202C8C4: ; 0x0202C8C4
-	ldrb r0, [r0, #6]
-	bx lr
-	thumb_func_end sub_0202C8C4
-
-	thumb_func_start sub_0202C8C8
-sub_0202C8C8: ; 0x0202C8C8
-	push {r4, r5, r6, lr}
-	add r6, r0, #0
-	mov r0, #1
-	add r5, r1, #0
-	lsl r0, r0, #8
-	add r4, r2, #0
-	cmp r5, r0
-	blt _0202C8DC
-	bl GF_AssertFail
-_0202C8DC:
-	cmp r4, #0x40
-	blt _0202C8E4
-	bl GF_AssertFail
-_0202C8E4:
-	cmp r5, #0
-	bne _0202C8EC
-	mov r0, #0
-	pop {r4, r5, r6, pc}
-_0202C8EC:
-	asr r0, r4, #1
-	lsr r0, r0, #0x1e
-	add r0, r4, r0
-	asr r1, r0, #2
-	sub r0, r5, #1
-	lsl r0, r0, #4
-	add r0, r1, r0
-	add r0, r6, r0
-	ldrb r3, [r0, #7]
-	lsr r2, r4, #0x1f
-	lsl r1, r4, #0x1e
-	sub r1, r1, r2
-	mov r0, #0x1e
-	ror r1, r0
-	add r0, r2, r1
-	lsl r0, r0, #1
-	add r1, r3, #0
-	asr r1, r0
-	mov r0, #3
-	and r0, r1
-	pop {r4, r5, r6, pc}
-	; .align 2, 0
-	thumb_func_end sub_0202C8C8
-
-	thumb_func_start sub_0202C918
-sub_0202C918: ; 0x0202C918
-	push {r3, r4, r5, r6, r7, lr}
-	add r7, r0, #0
-	add r5, r1, #0
-	add r4, r2, #0
-	str r3, [sp]
-	cmp r3, #4
-	blt _0202C92A
-	bl GF_AssertFail
-_0202C92A:
-	mov r0, #1
-	lsl r0, r0, #8
-	cmp r5, r0
-	blt _0202C936
-	bl GF_AssertFail
-_0202C936:
-	cmp r4, #0x40
-	blt _0202C93E
-	bl GF_AssertFail
-_0202C93E:
-	cmp r5, #0
-	beq _0202C98C
-	asr r0, r4, #1
-	lsr r0, r0, #0x1e
-	add r0, r4, r0
-	asr r2, r0, #2
-	sub r0, r5, #1
-	lsl r0, r0, #4
-	add r0, r2, r0
-	lsr r2, r4, #0x1f
-	lsl r4, r4, #0x1e
-	sub r4, r4, r2
-	mov r3, #0x1e
-	ror r4, r3
-	add r2, r2, r4
-	lsl r6, r2, #1
-	mov r2, #3
-	add r3, r2, #0
-	add r1, r7, #7
-	ldrb r4, [r1, r0]
-	lsl r3, r6
-	mov r2, #0xff
-	eor r2, r3
-	and r2, r4
-	ldr r3, [sp]
-	strb r2, [r1, r0]
-	ldrb r2, [r1, r0]
-	lsl r3, r6
-	orr r2, r3
-	strb r2, [r1, r0]
-	cmp r5, #0x67
-	beq _0202C986
-	add r0, r7, #0
-	mov r1, #1
-	bl sub_0202C994
-_0202C986:
-	mov r0, #0x1e
-	bl sub_02025C84
-_0202C98C:
-	pop {r3, r4, r5, r6, r7, pc}
-	; .align 2, 0
-	thumb_func_end sub_0202C918
-
-	thumb_func_start sub_0202C990
-sub_0202C990: ; 0x0202C990
-	ldrb r0, [r0, #4]
-	bx lr
-	thumb_func_end sub_0202C990
-
-	thumb_func_start sub_0202C994
-sub_0202C994: ; 0x0202C994
-	ldr r3, _0202C99C ; =sub_02025C84
-	strb r1, [r0, #4]
-	mov r0, #0x1e
-	bx r3
-	; .align 2, 0
-_0202C99C: .word sub_02025C84
-	thumb_func_end sub_0202C994
-
-	thumb_func_start sub_0202C9A0
-sub_0202C9A0: ; 0x0202C9A0
-	push {r3, r4, r5, r6, r7, lr}
-	str r0, [sp]
-	mov r0, #3
-	mov r7, #0
-	mov r4, #2
-	mov r6, #0xff
-	add r3, r0, #0
-_0202C9AE:
-	ldr r1, [sp]
-	add r1, r1, r7
-	ldrb r2, [r1, #7]
-	mov ip, r1
-	mov r1, #0
-_0202C9B8:
-	add r5, r2, #0
-	asr r5, r1
-	and r5, r3
-	cmp r5, #1
-	bne _0202C9D8
-	add r5, r0, #0
-	lsl r5, r1
-	eor r5, r6
-	and r2, r5
-	lsl r2, r2, #0x18
-	lsr r5, r2, #0x18
-	add r2, r4, #0
-	lsl r2, r1
-	orr r2, r5
-	lsl r2, r2, #0x18
-	lsr r2, r2, #0x18
-_0202C9D8:
-	add r1, r1, #2
-	cmp r1, #8
-	blt _0202C9B8
-	mov r1, ip
-	strb r2, [r1, #7]
-	mov r1, #0xff
-	add r7, r7, #1
-	lsl r1, r1, #4
-	cmp r7, r1
-	blt _0202C9AE
-	mov r0, #0x1e
-	bl sub_02025C84
-	pop {r3, r4, r5, r6, r7, pc}
-	thumb_func_end sub_0202C9A0
\ No newline at end of file
diff --git a/main.lsf b/main.lsf
index 51f5503a89..4f1e1b8c03 100644
--- a/main.lsf
+++ b/main.lsf
@@ -118,7 +118,7 @@ Static main
 	Object src/unk_0202B594.o
 	Object asm/unk_0202B604.o
 	Object src/unk_0202C7FC.o
-	Object asm/unk_0202C858.o
+	Object src/unk_0202C858.o
 	Object src/unk_0202C9F4.o
 	Object asm/unk_0202CBE4.o
 	Object asm/unk_0202CC64.o
diff --git a/src/unk_0202C858.c b/src/unk_0202C858.c
new file mode 100644
index 0000000000..356629aeb4
--- /dev/null
+++ b/src/unk_0202C858.c
@@ -0,0 +1,122 @@
+#include <nitro.h>
+#include <string.h>
+
+#include "struct_decls/struct_021C0794_decl.h"
+
+#include "struct_defs/struct_0202C878.h"
+
+#include "unk_020244AC.h"
+#include "unk_0202C858.h"
+
+int sub_0202C858 (void)
+{
+    return sizeof(UnkStruct_0202C878);
+}
+
+void sub_0202C860 (UnkStruct_0202C878 * param0)
+{
+    MI_CpuClear32(param0, sizeof(UnkStruct_0202C878));
+    sub_02025C84(30);
+}
+
+UnkStruct_0202C878 * sub_0202C878 (UnkStruct_021C0794 * param0)
+{
+    sub_02025C48(30);
+    return (UnkStruct_0202C878 *)sub_020245BC(param0, 30);
+}
+
+void sub_0202C88C (UnkStruct_0202C878 * param0, int param1, int param2)
+{
+    GF_ASSERT(param1 < 256);
+    GF_ASSERT(param2 < 64);
+
+    param0->unk_05 = param1;
+    param0->unk_06 = param2;
+
+    sub_0202C918(param0, param1, param2, 3);
+    sub_02025C84(30);
+}
+
+int sub_0202C8C0 (const UnkStruct_0202C878 * param0)
+{
+    return param0->unk_05;
+}
+
+int sub_0202C8C4 (const UnkStruct_0202C878 * param0)
+{
+    return param0->unk_06;
+}
+
+int sub_0202C8C8 (const UnkStruct_0202C878 * param0, int param1, int param2)
+{
+    int v0;
+
+    GF_ASSERT(param1 < 256);
+    GF_ASSERT(param2 < 64);
+
+    if (param1 == 0) {
+        return 0;
+    }
+
+    v0 = (param0->unk_07[(param1 - 1) * 16 + param2 / 4] >> ((param2 % 4) * 2)) & 3;
+
+    return v0;
+}
+
+void sub_0202C918 (UnkStruct_0202C878 * param0, int param1, int param2, int param3)
+{
+    u8 * v0;
+    u8 v1 = 3;
+    u8 v2;
+
+    GF_ASSERT(param3 < 4);
+    GF_ASSERT(param1 < 256);
+    GF_ASSERT(param2 < 64);
+
+    if (param1 == 0) {
+        return;
+    }
+
+    v0 = &param0->unk_07[(param1 - 1) * 16 + param2 / 4];
+
+    *v0 &= ((v1 << ((param2 % 4) * 2)) ^ 0xff);
+    *v0 |= param3 << ((param2 % 4) * 2);
+
+    if (param1 != 103) {
+        sub_0202C994(param0, 1);
+    }
+
+    sub_02025C84(30);
+}
+
+BOOL sub_0202C990 (const UnkStruct_0202C878 * param0)
+{
+    return param0->unk_04;
+}
+
+void sub_0202C994 (UnkStruct_0202C878 * param0, BOOL param1)
+{
+    param0->unk_04 = param1;
+    sub_02025C84(30);
+}
+
+void sub_0202C9A0 (UnkStruct_0202C878 * param0)
+{
+    int v0, v1;
+    u8 v2;
+
+    for (v0 = 0; v0 < (256 - 1) * 16; v0++) {
+        v2 = param0->unk_07[v0];
+
+        for (v1 = 0; v1 < 8; v1 += 2) {
+            if (((v2 >> v1) & 3) == 1) {
+                v2 &= ((3 << v1) ^ 0xff);
+                v2 |= (2 << v1);
+            }
+        }
+
+        param0->unk_07[v0] = v2;
+    }
+
+    sub_02025C84(30);
+}