diff --git a/asm/roulette_util.s b/asm/roulette_util.s
deleted file mode 100644
index 61f6f67b1..000000000
--- a/asm/roulette_util.s
+++ /dev/null
@@ -1,1431 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_8151678
-sub_8151678: @ 8151678
-	push {lr}
-	movs r1, 0
-	strb r1, [r0]
-	strh r1, [r0, 0x2]
-	adds r0, 0x4
-	movs r2, 0xC0
-	bl memset
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151678
-
-	thumb_func_start sub_815168C
-sub_815168C: @ 815168C
-	push {r4-r7,lr}
-	adds r3, r0, 0
-	lsls r1, 24
-	lsrs r6, r1, 24
-	cmp r6, 0xF
-	bhi _081516A8
-	lsls r0, r6, 1
-	adds r0, r6
-	lsls r0, 2
-	adds r5, r3, r0
-	ldrb r7, [r5, 0x4]
-	lsrs r0, r7, 7
-	cmp r0, 0
-	beq _081516AC
-_081516A8:
-	movs r0, 0xFF
-	b _0815170A
-_081516AC:
-	ldrh r0, [r2]
-	movs r4, 0
-	strh r0, [r5, 0x8]
-	ldrh r0, [r2, 0x2]
-	strh r0, [r5, 0xA]
-	ldrb r0, [r2, 0x4]
-	strb r0, [r5, 0xC]
-	ldrb r0, [r2, 0x5]
-	strb r0, [r5, 0xD]
-	ldrb r0, [r2, 0x6]
-	strb r0, [r5, 0xE]
-	ldrb r3, [r2, 0x7]
-	lsls r0, r3, 27
-	lsrs r0, 27
-	ldrb r2, [r5, 0xF]
-	movs r1, 0x20
-	negs r1, r1
-	ands r1, r2
-	orrs r1, r0
-	movs r0, 0x60
-	ands r0, r3
-	movs r2, 0x61
-	negs r2, r2
-	ands r1, r2
-	orrs r1, r0
-	lsls r3, 24
-	asrs r3, 31
-	lsls r3, 7
-	movs r0, 0x7F
-	ands r1, r0
-	orrs r1, r3
-	strb r1, [r5, 0xF]
-	subs r0, 0xFF
-	ands r0, r7
-	movs r2, 0x80
-	orrs r0, r2
-	strb r0, [r5, 0x4]
-	strb r4, [r5, 0x6]
-	strb r4, [r5, 0x5]
-	lsls r1, 24
-	cmp r1, 0
-	bge _08151704
-	movs r0, 0xFF
-	b _08151706
-_08151704:
-	movs r0, 0x1
-_08151706:
-	strb r0, [r5, 0x7]
-	adds r0, r6, 0
-_0815170A:
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_815168C
-
-	thumb_func_start sub_8151710
-sub_8151710: @ 8151710
-	push {r4,lr}
-	adds r2, r0, 0
-	lsls r1, 24
-	lsrs r1, 24
-	adds r4, r1, 0
-	cmp r4, 0xF
-	bhi _0815173C
-	lsls r0, r4, 1
-	adds r0, r4
-	lsls r0, 2
-	adds r1, r2, r0
-	ldrb r0, [r1, 0x4]
-	lsrs r0, 7
-	cmp r0, 0
-	beq _0815173C
-	adds r0, r1, 0x4
-	movs r1, 0
-	movs r2, 0xC
-	bl memset
-	adds r0, r4, 0
-	b _0815173E
-_0815173C:
-	movs r0, 0xFF
-_0815173E:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151710
-
-	thumb_func_start sub_8151744
-sub_8151744: @ 8151744
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	adds r5, r0, 0
-	movs r0, 0
-	mov r12, r0
-	ldrb r1, [r5, 0x8]
-	cmp r12, r1
-	bcc _0815175C
-	b _081518F4
-_0815175C:
-	movs r7, 0x1F
-	ldr r0, =0xfffffc1f
-	mov r10, r0
-	movs r1, 0x7D
-	negs r1, r1
-	mov r9, r1
-	movs r0, 0x1F
-	mov r8, r0
-_0815176C:
-	ldrh r0, [r5, 0x6]
-	add r0, r12
-	lsls r0, 1
-	ldr r1, =gPlttBufferFaded
-	adds r3, r0, r1
-	ldr r1, =gPlttBufferUnfaded
-	adds r6, r0, r1
-	ldrb r0, [r5]
-	lsls r0, 25
-	lsrs r0, 25
-	cmp r0, 0x1
-	beq _08151798
-	cmp r0, 0x2
-	beq _081517F6
-	b _081518E2
-	.pool
-_08151798:
-	ldr r0, [r3]
-	lsls r2, r0, 27
-	lsrs r0, r2, 27
-	movs r1, 0x3
-	ldrsb r1, [r5, r1]
-	adds r0, r1
-	cmp r0, 0x1F
-	bhi _081517BA
-	lsrs r0, r2, 27
-	adds r0, r1
-	ands r0, r7
-	ldrb r2, [r3]
-	movs r1, 0x20
-	negs r1, r1
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r3]
-_081517BA:
-	ldr r0, [r3]
-	lsls r2, r0, 22
-	lsrs r0, r2, 27
-	movs r1, 0x3
-	ldrsb r1, [r5, r1]
-	adds r0, r1
-	cmp r0, 0x1F
-	bhi _081517DE
-	lsrs r0, r2, 27
-	adds r0, r1
-	mov r1, r8
-	ands r0, r1
-	lsls r0, 5
-	ldrh r2, [r3]
-	mov r1, r10
-	ands r1, r2
-	orrs r1, r0
-	strh r1, [r3]
-_081517DE:
-	ldr r0, [r3]
-	lsls r2, r0, 17
-	lsrs r0, r2, 27
-	movs r1, 0x3
-	ldrsb r1, [r5, r1]
-	adds r0, r1
-	cmp r0, 0x1F
-	bls _081517F0
-	b _081518E2
-_081517F0:
-	lsrs r0, r2, 27
-	adds r0, r1
-	b _081518D4
-_081517F6:
-	movs r0, 0x3
-	ldrsb r0, [r5, r0]
-	cmp r0, 0
-	bge _08151868
-	ldr r0, [r3]
-	lsls r4, r0, 27
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 27
-	lsrs r0, 27
-	cmp r1, r0
-	blt _08151826
-	lsrs r0, r4, 27
-	adds r0, r2
-	ands r0, r7
-	ldrb r2, [r3]
-	movs r1, 0x20
-	negs r1, r1
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r3]
-_08151826:
-	ldr r0, [r3]
-	lsls r4, r0, 22
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 22
-	lsrs r0, 27
-	cmp r1, r0
-	blt _08151850
-	lsrs r0, r4, 27
-	adds r0, r2
-	mov r1, r8
-	ands r0, r1
-	lsls r0, 5
-	ldrh r2, [r3]
-	mov r1, r10
-	ands r1, r2
-	orrs r1, r0
-	strh r1, [r3]
-_08151850:
-	ldr r0, [r3]
-	lsls r4, r0, 17
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 17
-	lsrs r0, 27
-	cmp r1, r0
-	blt _081518E2
-	b _081518D0
-_08151868:
-	ldr r0, [r3]
-	lsls r4, r0, 27
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 27
-	lsrs r0, 27
-	cmp r1, r0
-	bgt _08151890
-	lsrs r0, r4, 27
-	adds r0, r2
-	ands r0, r7
-	ldrb r2, [r3]
-	movs r1, 0x20
-	negs r1, r1
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r3]
-_08151890:
-	ldr r0, [r3]
-	lsls r4, r0, 22
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 22
-	lsrs r0, 27
-	cmp r1, r0
-	bgt _081518BA
-	lsrs r0, r4, 27
-	adds r0, r2
-	mov r1, r8
-	ands r0, r1
-	lsls r0, 5
-	ldrh r2, [r3]
-	mov r1, r10
-	ands r1, r2
-	orrs r1, r0
-	strh r1, [r3]
-_081518BA:
-	ldr r0, [r3]
-	lsls r4, r0, 17
-	lsrs r1, r4, 27
-	movs r2, 0x3
-	ldrsb r2, [r5, r2]
-	adds r1, r2
-	ldr r0, [r6]
-	lsls r0, 17
-	lsrs r0, 27
-	cmp r1, r0
-	bgt _081518E2
-_081518D0:
-	lsrs r0, r4, 27
-	adds r0, r2
-_081518D4:
-	ands r0, r7
-	lsls r0, 2
-	ldrb r2, [r3, 0x1]
-	mov r1, r9
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r3, 0x1]
-_081518E2:
-	mov r0, r12
-	adds r0, 0x1
-	lsls r0, 24
-	lsrs r0, 24
-	mov r12, r0
-	ldrb r0, [r5, 0x8]
-	cmp r12, r0
-	bcs _081518F4
-	b _0815176C
-_081518F4:
-	ldrb r1, [r5, 0x2]
-	adds r0, r1, 0x1
-	strb r0, [r5, 0x2]
-	ldrb r0, [r5, 0xB]
-	lsls r0, 27
-	lsls r1, 24
-	asrs r0, 3
-	cmp r1, r0
-	beq _0815190A
-	movs r0, 0
-	b _0815193E
-_0815190A:
-	movs r0, 0
-	strb r0, [r5, 0x2]
-	movs r0, 0x3
-	ldrsb r0, [r5, r0]
-	negs r0, r0
-	strb r0, [r5, 0x3]
-	ldrb r2, [r5]
-	movs r1, 0x7F
-	movs r0, 0x7F
-	ands r0, r2
-	cmp r0, 0x1
-	bne _0815192A
-	lsls r0, r2, 25
-	lsrs r0, 25
-	adds r0, 0x1
-	b _08151930
-_0815192A:
-	lsls r0, r2, 25
-	lsrs r0, 25
-	subs r0, 0x1
-_08151930:
-	ands r0, r1
-	movs r1, 0x80
-	negs r1, r1
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r5]
-	movs r0, 0x1
-_0815193E:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151744
-
-	thumb_func_start sub_815194C
-sub_815194C: @ 815194C
-	push {r4,r5,lr}
-	adds r3, r0, 0
-	movs r2, 0
-	ldrb r0, [r3]
-	lsls r0, 25
-	lsrs r0, 25
-	cmp r0, 0x1
-	beq _08151962
-	cmp r0, 0x2
-	beq _08151990
-	b _081519CA
-_08151962:
-	ldrb r0, [r3, 0x8]
-	cmp r2, r0
-	bcs _08151982
-	ldr r4, =gPlttBufferFaded
-_0815196A:
-	ldrh r0, [r3, 0x6]
-	adds r0, r2
-	lsls r0, 1
-	adds r0, r4
-	ldrh r1, [r3, 0x4]
-	strh r1, [r0]
-	adds r0, r2, 0x1
-	lsls r0, 24
-	lsrs r2, r0, 24
-	ldrb r0, [r3, 0x8]
-	cmp r2, r0
-	bcc _0815196A
-_08151982:
-	ldrb r2, [r3]
-	lsls r1, r2, 25
-	lsrs r1, 25
-	adds r1, 0x1
-	b _081519BC
-	.pool
-_08151990:
-	ldrb r0, [r3, 0x8]
-	cmp r2, r0
-	bcs _081519B4
-	ldr r5, =gPlttBufferFaded
-	ldr r4, =gPlttBufferUnfaded
-_0815199A:
-	ldrh r0, [r3, 0x6]
-	adds r0, r2
-	lsls r0, 1
-	adds r1, r0, r5
-	adds r0, r4
-	ldrh r0, [r0]
-	strh r0, [r1]
-	adds r0, r2, 0x1
-	lsls r0, 24
-	lsrs r2, r0, 24
-	ldrb r0, [r3, 0x8]
-	cmp r2, r0
-	bcc _0815199A
-_081519B4:
-	ldrb r2, [r3]
-	lsls r1, r2, 25
-	lsrs r1, 25
-	subs r1, 0x1
-_081519BC:
-	movs r0, 0x7F
-	ands r1, r0
-	movs r0, 0x80
-	negs r0, r0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r3]
-_081519CA:
-	movs r0, 0x1
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_815194C
-
-	thumb_func_start task_tutorial_controls_fadein
-task_tutorial_controls_fadein: @ 81519DC
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	movs r5, 0
-	ldrb r0, [r4]
-	cmp r0, 0
-	beq _08151A40
-_081519E8:
-	ldrh r0, [r4, 0x2]
-	asrs r0, r5
-	movs r1, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _08151A36
-	lsls r1, r5, 1
-	adds r0, r1, r5
-	lsls r3, r0, 2
-	adds r2, r4, r3
-	ldrb r0, [r2, 0x5]
-	subs r0, 0x1
-	strb r0, [r2, 0x5]
-	lsls r0, 24
-	lsrs r0, 24
-	adds r6, r1, 0
-	cmp r0, 0xFF
-	bne _08151A36
-	ldrh r0, [r2, 0x8]
-	movs r2, 0x80
-	lsls r2, 8
-	adds r1, r2, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _08151A24
-	adds r0, r3, 0x4
-	adds r0, r4, r0
-	bl sub_8151744
-	b _08151A2C
-_08151A24:
-	adds r0, r3, 0x4
-	adds r0, r4, r0
-	bl sub_815194C
-_08151A2C:
-	adds r0, r6, r5
-	lsls r0, 2
-	adds r0, r4, r0
-	ldrb r1, [r0, 0xD]
-	strb r1, [r0, 0x5]
-_08151A36:
-	adds r0, r5, 0x1
-	lsls r0, 24
-	lsrs r5, r0, 24
-	cmp r5, 0xF
-	bls _081519E8
-_08151A40:
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end task_tutorial_controls_fadein
-
-	thumb_func_start sub_8151A48
-sub_8151A48: @ 8151A48
-	push {r4-r7,lr}
-	adds r3, r0, 0
-	lsls r1, 16
-	lsrs r6, r1, 16
-	movs r4, 0
-	ldrb r0, [r3]
-	adds r0, 0x1
-	strb r0, [r3]
-	movs r5, 0x1
-	movs r7, 0x80
-	negs r7, r7
-_08151A5E:
-	adds r0, r6, 0
-	asrs r0, r4
-	ands r0, r5
-	cmp r0, 0
-	beq _08151A8C
-	lsls r0, r4, 1
-	adds r0, r4
-	lsls r0, 2
-	adds r2, r3, r0
-	ldrb r0, [r2, 0x4]
-	lsrs r0, 7
-	cmp r0, 0
-	beq _08151A8C
-	adds r0, r5, 0
-	lsls r0, r4
-	ldrh r1, [r3, 0x2]
-	orrs r0, r1
-	strh r0, [r3, 0x2]
-	ldrb r1, [r2, 0x4]
-	adds r0, r7, 0
-	ands r0, r1
-	orrs r0, r5
-	strb r0, [r2, 0x4]
-_08151A8C:
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	cmp r4, 0xF
-	bls _08151A5E
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151A48
-
-	thumb_func_start sub_8151A9C
-sub_8151A9C: @ 8151A9C
-	push {r4-r7,lr}
-	sub sp, 0x4
-	adds r6, r0, 0
-	lsls r1, 16
-	lsrs r7, r1, 16
-	movs r5, 0
-	movs r3, 0x1
-_08151AAA:
-	ldrh r0, [r6, 0x2]
-	asrs r0, r5
-	ands r0, r3
-	cmp r0, 0
-	beq _08151B12
-	lsls r0, r5, 1
-	adds r0, r5
-	lsls r0, 2
-	adds r4, r6, r0
-	ldrb r0, [r4, 0x4]
-	lsrs r0, 7
-	cmp r0, 0
-	beq _08151B12
-	adds r0, r7, 0
-	asrs r0, r5
-	ands r0, r3
-	cmp r0, 0
-	beq _08151B12
-	ldrh r1, [r4, 0xA]
-	lsls r1, 1
-	ldr r0, =gPlttBufferFaded
-	adds r0, r1, r0
-	ldr r2, =gPlttBufferUnfaded
-	adds r1, r2
-	ldrb r2, [r4, 0xC]
-	lsls r2, 1
-	str r3, [sp]
-	bl memcpy
-	ldrb r0, [r4, 0x4]
-	movs r2, 0x80
-	negs r2, r2
-	adds r1, r2, 0
-	ands r0, r1
-	strb r0, [r4, 0x4]
-	movs r0, 0
-	strb r0, [r4, 0x6]
-	strb r0, [r4, 0x5]
-	ldrb r0, [r4, 0xF]
-	lsls r0, 24
-	ldr r3, [sp]
-	cmp r0, 0
-	bge _08151B10
-	movs r0, 0xFF
-	strb r0, [r4, 0x7]
-	b _08151B12
-	.pool
-_08151B10:
-	strb r3, [r4, 0x7]
-_08151B12:
-	adds r0, r5, 0x1
-	lsls r0, 24
-	lsrs r5, r0, 24
-	cmp r5, 0xF
-	bls _08151AAA
-	ldr r0, =0x0000ffff
-	cmp r7, r0
-	bne _08151B2C
-	movs r0, 0
-	strb r0, [r6]
-	b _08151B30
-	.pool
-_08151B2C:
-	ldrh r0, [r6, 0x2]
-	bics r0, r7
-_08151B30:
-	strh r0, [r6, 0x2]
-	add sp, 0x4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151A9C
-
-	thumb_func_start sub_8151B3C
-sub_8151B3C: @ 8151B3C
-	push {r4,r5,lr}
-	adds r5, r0, 0
-	movs r4, 0
-	strh r4, [r5]
-	adds r0, r5, 0x4
-	movs r1, 0
-	movs r2, 0xC0
-	bl memset
-_08151B4E:
-	lsls r0, r4, 1
-	adds r0, r4
-	lsls r0, 2
-	adds r0, r5, r0
-	strb r4, [r0, 0x4]
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	cmp r4, 0xF
-	bls _08151B4E
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151B3C
-
-	thumb_func_start sub_8151B68
-sub_8151B68: @ 8151B68
-	push {r4,r5,lr}
-	adds r2, r0, 0
-	adds r5, r1, 0
-	movs r3, 0
-	movs r4, 0
-	ldrb r0, [r2, 0x5]
-	lsrs r0, 7
-	cmp r0, 0
-	bne _08151B7E
-	adds r4, r2, 0x4
-	b _08151B9C
-_08151B7E:
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0xF
-	bhi _08151B9C
-	lsls r0, r3, 1
-	adds r0, r3
-	lsls r1, r0, 2
-	adds r0, r2, r1
-	ldrb r0, [r0, 0x5]
-	lsrs r0, 7
-	cmp r0, 0
-	bne _08151B7E
-	adds r0, r1, 0x4
-	adds r4, r2, r0
-_08151B9C:
-	cmp r4, 0
-	beq _08151BCA
-	ldrb r1, [r4, 0x1]
-	movs r0, 0x10
-	negs r0, r0
-	ands r0, r1
-	movs r1, 0x11
-	negs r1, r1
-	ands r0, r1
-	movs r1, 0x40
-	orrs r0, r1
-	movs r1, 0x80
-	orrs r0, r1
-	strb r0, [r4, 0x1]
-	movs r0, 0
-	strb r0, [r4, 0x2]
-	strb r0, [r4, 0x3]
-	adds r1, r4, 0x4
-	adds r0, r5, 0
-	ldm r0!, {r2,r4}
-	stm r1!, {r2,r4}
-	adds r0, r3, 0
-	b _08151BCC
-_08151BCA:
-	movs r0, 0xFF
-_08151BCC:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151B68
-
-	thumb_func_start sub_8151BD4
-sub_8151BD4: @ 8151BD4
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	ldrb r1, [r4, 0x1]
-	movs r2, 0x40
-	adds r0, r2, 0
-	ands r0, r1
-	cmp r0, 0
-	bne _08151C16
-	ldrb r1, [r4, 0xB]
-	adds r0, r2, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _08151C16
-	ldrh r2, [r4, 0x6]
-	ldrb r0, [r4, 0x8]
-	adds r0, r2, r0
-	cmp r2, r0
-	bge _08151C16
-	ldr r5, =gPlttBufferFaded
-	ldr r3, =gPlttBufferUnfaded
-_08151BFC:
-	lsls r0, r2, 1
-	adds r1, r0, r5
-	adds r0, r3
-	ldrh r0, [r0]
-	strh r0, [r1]
-	adds r0, r2, 0x1
-	lsls r0, 16
-	lsrs r2, r0, 16
-	ldrh r0, [r4, 0x6]
-	ldrb r1, [r4, 0x8]
-	adds r0, r1
-	cmp r2, r0
-	blt _08151BFC
-_08151C16:
-	adds r0, r4, 0x4
-	movs r1, 0
-	movs r2, 0x8
-	bl memset
-	ldrb r1, [r4, 0x1]
-	movs r0, 0x10
-	negs r0, r0
-	ands r0, r1
-	movs r1, 0x11
-	negs r1, r1
-	ands r0, r1
-	subs r1, 0x10
-	ands r0, r1
-	movs r1, 0x40
-	orrs r0, r1
-	movs r1, 0x7F
-	ands r0, r1
-	strb r0, [r4, 0x1]
-	movs r0, 0
-	strb r0, [r4, 0x3]
-	strb r0, [r4, 0x2]
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8151BD4
-
-	thumb_func_start sub_8151C50
-sub_8151C50: @ 8151C50
-	push {r4-r6,lr}
-	adds r6, r0, 0
-	lsls r1, 16
-	lsrs r4, r1, 16
-	lsls r2, 24
-	movs r5, 0
-	cmp r2, 0
-	bne _08151C74
-	movs r1, 0xF
-	ands r1, r4
-	lsls r0, r1, 1
-	adds r0, r1
-	lsls r0, 2
-	adds r0, 0x4
-	adds r0, r6, r0
-	bl sub_8151BD4
-	b _08151CA0
-_08151C74:
-	movs r0, 0x1
-	ands r0, r4
-	cmp r0, 0
-	beq _08151C94
-	lsls r0, r5, 1
-	adds r0, r5
-	lsls r1, r0, 2
-	adds r0, r6, r1
-	ldrb r0, [r0, 0x5]
-	lsrs r0, 7
-	cmp r0, 0
-	beq _08151C94
-	adds r0, r1, 0x4
-	adds r0, r6, r0
-	bl sub_8151BD4
-_08151C94:
-	lsrs r4, 1
-	adds r0, r5, 0x1
-	lsls r0, 16
-	lsrs r5, r0, 16
-	cmp r5, 0xF
-	bls _08151C74
-_08151CA0:
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151C50
-
-	thumb_func_start sub_8151CA8
-sub_8151CA8: @ 8151CA8
-	push {r4-r7,lr}
-	adds r5, r0, 0
-	lsls r1, 16
-	lsrs r4, r1, 16
-	lsls r2, 24
-	movs r3, 0
-	cmp r2, 0
-	bne _08151CDC
-	movs r0, 0xF
-	adds r3, r0, 0
-	ands r3, r4
-	lsls r1, r3, 1
-	adds r1, r3
-	lsls r1, 2
-	adds r1, r5, r1
-	ldrb r2, [r1, 0x5]
-	movs r0, 0x41
-	negs r0, r0
-	ands r0, r2
-	strb r0, [r1, 0x5]
-	movs r0, 0x1
-	lsls r0, r3
-	ldrh r1, [r5]
-	orrs r0, r1
-	strh r0, [r5]
-	b _08151D20
-_08151CDC:
-	movs r6, 0x1
-	movs r7, 0x41
-	negs r7, r7
-_08151CE2:
-	adds r0, r4, 0
-	ands r0, r6
-	cmp r0, 0
-	beq _08151D00
-	lsls r0, r3, 1
-	adds r0, r3
-	lsls r0, 2
-	adds r2, r5, r0
-	ldrb r1, [r2, 0x5]
-	lsrs r0, r1, 7
-	cmp r0, 0
-	beq _08151D00
-	lsls r0, r1, 25
-	cmp r0, 0
-	blt _08151D06
-_08151D00:
-	lsls r0, r4, 17
-	lsrs r4, r0, 16
-	b _08151D16
-_08151D06:
-	adds r0, r7, 0
-	ands r0, r1
-	strb r0, [r2, 0x5]
-	adds r0, r6, 0
-	lsls r0, r3
-	ldrh r1, [r5]
-	orrs r0, r1
-	strh r0, [r5]
-_08151D16:
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0xF
-	bls _08151CE2
-_08151D20:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151CA8
-
-	thumb_func_start sub_8151D28
-sub_8151D28: @ 8151D28
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	mov r8, r0
-	lsls r1, 16
-	lsrs r7, r1, 16
-	lsls r2, 24
-	movs r0, 0
-	mov r12, r0
-	cmp r2, 0
-	bne _08151DB0
-	movs r1, 0xF
-	ands r1, r7
-	lsls r0, r1, 1
-	adds r0, r1
-	lsls r0, 2
-	adds r0, 0x4
-	mov r1, r8
-	adds r3, r1, r0
-	ldrb r1, [r3, 0x1]
-	movs r0, 0xC0
-	ands r0, r1
-	cmp r0, 0x80
-	bne _08151E3A
-	ldrb r1, [r3, 0xB]
-	movs r0, 0x40
-	ands r0, r1
-	cmp r0, 0
-	beq _08151D8E
-	ldrh r2, [r3, 0x6]
-	ldrb r0, [r3, 0x8]
-	adds r0, r2, r0
-	cmp r2, r0
-	bge _08151D8E
-	ldr r5, =gPlttBufferFaded
-	ldr r4, =gPlttBufferUnfaded
-_08151D74:
-	lsls r0, r2, 1
-	adds r1, r0, r5
-	adds r0, r4
-	ldrh r0, [r0]
-	strh r0, [r1]
-	adds r0, r2, 0x1
-	lsls r0, 16
-	lsrs r2, r0, 16
-	ldrh r0, [r3, 0x6]
-	ldrb r1, [r3, 0x8]
-	adds r0, r1
-	cmp r2, r0
-	blt _08151D74
-_08151D8E:
-	ldrb r0, [r3, 0x1]
-	movs r1, 0x40
-	orrs r0, r1
-	strb r0, [r3, 0x1]
-	movs r1, 0x1
-	mov r2, r12
-	lsls r1, r2
-	mov r2, r8
-	ldrh r0, [r2]
-	bics r0, r1
-	strh r0, [r2]
-	b _08151E3A
-	.pool
-_08151DB0:
-	movs r0, 0x1
-	mov r9, r0
-	movs r1, 0x40
-	mov r10, r1
-_08151DB8:
-	mov r2, r12
-	lsls r0, r2, 1
-	add r0, r12
-	lsls r0, 2
-	adds r0, 0x4
-	mov r1, r8
-	adds r3, r1, r0
-	adds r0, r7, 0
-	mov r2, r9
-	ands r0, r2
-	cmp r0, 0
-	beq _08151DDA
-	ldrb r1, [r3, 0x1]
-	movs r0, 0xC0
-	ands r0, r1
-	cmp r0, 0x80
-	beq _08151DE4
-_08151DDA:
-	lsls r0, r7, 17
-	lsrs r7, r0, 16
-	mov r5, r12
-	adds r5, 0x1
-	b _08151E30
-_08151DE4:
-	ldrb r1, [r3, 0xB]
-	mov r0, r10
-	ands r0, r1
-	mov r5, r12
-	adds r5, 0x1
-	cmp r0, 0
-	beq _08151E1A
-	ldrh r2, [r3, 0x6]
-	ldrb r0, [r3, 0x8]
-	adds r0, r2, r0
-	cmp r2, r0
-	bge _08151E1A
-	ldr r6, =gPlttBufferFaded
-	ldr r4, =gPlttBufferUnfaded
-_08151E00:
-	lsls r0, r2, 1
-	adds r1, r0, r6
-	adds r0, r4
-	ldrh r0, [r0]
-	strh r0, [r1]
-	adds r0, r2, 0x1
-	lsls r0, 16
-	lsrs r2, r0, 16
-	ldrh r0, [r3, 0x6]
-	ldrb r1, [r3, 0x8]
-	adds r0, r1
-	cmp r2, r0
-	blt _08151E00
-_08151E1A:
-	ldrb r1, [r3, 0x1]
-	mov r0, r10
-	orrs r0, r1
-	strb r0, [r3, 0x1]
-	mov r1, r9
-	mov r0, r12
-	lsls r1, r0
-	mov r2, r8
-	ldrh r0, [r2]
-	bics r0, r1
-	strh r0, [r2]
-_08151E30:
-	lsls r0, r5, 24
-	lsrs r0, 24
-	mov r12, r0
-	cmp r0, 0xF
-	bls _08151DB8
-_08151E3A:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8151D28
-
-	thumb_func_start sub_8151E50
-sub_8151E50: @ 8151E50
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x4
-	str r0, [sp]
-	movs r0, 0
-	mov r10, r0
-	ldr r1, [sp]
-	ldrh r0, [r1]
-	cmp r0, 0
-	bne _08151E6C
-	b _08151FF6
-_08151E6C:
-	movs r2, 0xF
-	mov r9, r2
-	movs r3, 0x10
-	negs r3, r3
-	mov r8, r3
-	movs r7, 0x1
-_08151E78:
-	mov r5, r10
-	lsls r0, r5, 1
-	add r0, r10
-	lsls r0, 2
-	adds r0, 0x4
-	ldr r1, [sp]
-	adds r4, r1, r0
-	ldrb r2, [r4, 0x1]
-	movs r3, 0xC0
-	ands r3, r2
-	cmp r3, 0x80
-	beq _08151E92
-	b _08151FE6
-_08151E92:
-	ldr r0, =gPaletteFade
-	ldrb r1, [r0, 0x7]
-	adds r0, r3, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _08151EA8
-	ldrb r0, [r4, 0xB]
-	ands r3, r0
-	cmp r3, 0
-	beq _08151EA8
-	b _08151FE6
-_08151EA8:
-	ldrb r0, [r4, 0x2]
-	subs r0, 0x1
-	strb r0, [r4, 0x2]
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0xFF
-	beq _08151EB8
-	b _08151FE6
-_08151EB8:
-	ldrb r0, [r4, 0x9]
-	strb r0, [r4, 0x2]
-	ldrh r0, [r4, 0x6]
-	ldrb r1, [r4, 0x8]
-	lsls r2, 28
-	lsrs r2, 28
-	ldrh r3, [r4, 0x4]
-	bl BlendPalette
-	ldrb r5, [r4, 0xB]
-	lsls r0, r5, 26
-	asrs r0, 30
-	cmp r0, 0x1
-	beq _08151F16
-	cmp r0, 0x1
-	bgt _08151EE4
-	cmp r0, 0
-	beq _08151EEA
-	b _08151FD0
-	.pool
-_08151EE4:
-	cmp r0, 0x2
-	beq _08151F92
-	b _08151FD0
-_08151EEA:
-	ldrb r2, [r4, 0x1]
-	lsls r1, r2, 28
-	lsrs r0, r1, 28
-	adds r0, 0x1
-	mov r3, r9
-	ands r0, r3
-	mov r6, r8
-	adds r3, r6, 0
-	ands r3, r2
-	orrs r3, r0
-	strb r3, [r4, 0x1]
-	lsrs r1, 28
-	lsls r0, r5, 28
-	asrs r0, 28
-	cmp r1, r0
-	bne _08151FD0
-	ldrb r0, [r4, 0x3]
-	adds r0, 0x1
-	strb r0, [r4, 0x3]
-	ands r3, r6
-	strb r3, [r4, 0x1]
-	b _08151FD0
-_08151F16:
-	ldrb r3, [r4, 0x1]
-	movs r0, 0x10
-	ands r0, r3
-	cmp r0, 0
-	beq _08151F54
-	lsls r0, r3, 28
-	lsrs r0, 28
-	subs r0, 0x1
-	mov r5, r9
-	ands r0, r5
-	mov r2, r8
-	ands r2, r3
-	orrs r2, r0
-	strb r2, [r4, 0x1]
-	cmp r0, 0
-	bne _08151FD0
-	ldrb r0, [r4, 0x3]
-	adds r0, 0x1
-	strb r0, [r4, 0x3]
-	lsls r0, r2, 27
-	lsrs r0, 31
-	eors r0, r7
-	ands r0, r7
-	lsls r0, 4
-	movs r3, 0x11
-	negs r3, r3
-	adds r1, r3, 0
-	ands r2, r1
-	orrs r2, r0
-	strb r2, [r4, 0x1]
-	b _08151FD0
-_08151F54:
-	lsls r0, r5, 28
-	asrs r0, 28
-	subs r0, 0x1
-	mov r5, r9
-	ands r0, r5
-	lsls r2, r3, 28
-	lsrs r1, r2, 28
-	adds r1, 0x1
-	ands r1, r5
-	mov r5, r8
-	ands r3, r5
-	orrs r3, r1
-	strb r3, [r4, 0x1]
-	lsrs r2, 28
-	cmp r2, r0
-	bne _08151FD0
-	ldrb r0, [r4, 0x3]
-	adds r0, 0x1
-	strb r0, [r4, 0x3]
-	lsls r0, r3, 27
-	lsrs r0, 31
-	eors r0, r7
-	ands r0, r7
-	lsls r0, 4
-	movs r2, 0x11
-	negs r2, r2
-	adds r1, r2, 0
-	ands r3, r1
-	orrs r3, r0
-	strb r3, [r4, 0x1]
-	b _08151FD0
-_08151F92:
-	ldrb r2, [r4, 0x1]
-	movs r0, 0x10
-	ands r0, r2
-	cmp r0, 0
-	beq _08151FA2
-	mov r0, r8
-	ands r0, r2
-	b _08151FB0
-_08151FA2:
-	lsls r1, r5, 28
-	asrs r1, 28
-	mov r3, r9
-	ands r1, r3
-	mov r0, r8
-	ands r0, r2
-	orrs r0, r1
-_08151FB0:
-	strb r0, [r4, 0x1]
-	ldrb r2, [r4, 0x1]
-	lsls r0, r2, 27
-	lsrs r0, 31
-	eors r0, r7
-	ands r0, r7
-	lsls r0, 4
-	movs r5, 0x11
-	negs r5, r5
-	adds r1, r5, 0
-	ands r2, r1
-	orrs r2, r0
-	strb r2, [r4, 0x1]
-	ldrb r0, [r4, 0x3]
-	adds r0, 0x1
-	strb r0, [r4, 0x3]
-_08151FD0:
-	ldrb r1, [r4, 0xA]
-	cmp r1, 0xFF
-	beq _08151FE6
-	ldrb r0, [r4, 0x3]
-	cmp r0, r1
-	bne _08151FE6
-	ldrb r1, [r4]
-	ldr r0, [sp]
-	movs r2, 0
-	bl sub_8151D28
-_08151FE6:
-	mov r0, r10
-	adds r0, 0x1
-	lsls r0, 24
-	lsrs r0, 24
-	mov r10, r0
-	cmp r0, 0xF
-	bhi _08151FF6
-	b _08151E78
-_08151FF6:
-	add sp, 0x4
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8151E50
-
-	thumb_func_start sub_8152008
-sub_8152008: @ 8152008
-	push {r4-r7,lr}
-	adds r6, r0, 0
-	ldr r0, [sp, 0x14]
-	ldr r4, [sp, 0x18]
-	lsls r1, 16
-	lsrs r7, r1, 16
-	lsls r2, 24
-	lsrs r2, 24
-	lsls r3, 24
-	lsls r0, 24
-	lsrs r5, r0, 24
-	lsls r4, 24
-	lsrs r4, 24
-	movs r1, 0
-	lsrs r3, 19
-	adds r3, r2
-	lsls r3, 1
-	adds r6, r3
-	cmp r1, r4
-	bcs _08152052
-_08152030:
-	lsls r0, r1, 6
-	adds r2, r6, r0
-	movs r0, 0
-	adds r3, r1, 0x1
-	cmp r0, r5
-	bcs _0815204A
-_0815203C:
-	strh r7, [r2]
-	adds r2, 0x2
-	adds r0, 0x1
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, r5
-	bcc _0815203C
-_0815204A:
-	lsls r0, r3, 24
-	lsrs r1, r0, 24
-	cmp r1, r4
-	bcc _08152030
-_08152052:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8152008
-
-	thumb_func_start sub_8152058
-sub_8152058: @ 8152058
-	push {r4-r7,lr}
-	adds r7, r0, 0
-	ldr r0, [sp, 0x14]
-	ldr r4, [sp, 0x18]
-	lsls r2, 24
-	lsrs r2, 24
-	lsls r3, 24
-	lsls r0, 24
-	lsrs r5, r0, 24
-	lsls r4, 24
-	lsrs r6, r4, 24
-	movs r4, 0
-	lsrs r3, 19
-	adds r3, r2
-	lsls r3, 1
-	adds r7, r3
-	cmp r4, r6
-	bcs _081520A2
-_0815207C:
-	lsls r0, r4, 6
-	adds r2, r7, r0
-	movs r3, 0
-	adds r4, 0x1
-	cmp r3, r5
-	bcs _0815209A
-_08152088:
-	ldrh r0, [r1]
-	strh r0, [r2]
-	adds r1, 0x2
-	adds r2, 0x2
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, r5
-	bcc _08152088
-_0815209A:
-	lsls r0, r4, 24
-	lsrs r4, r0, 24
-	cmp r4, r6
-	bcc _0815207C
-_081520A2:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8152058
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/include/roulette.h b/include/roulette.h
new file mode 100755
index 000000000..71100d0d3
--- /dev/null
+++ b/include/roulette.h
@@ -0,0 +1,34 @@
+#ifndef GUARD_ROULETTE_H
+#define GUARD_ROULETTE_H
+
+struct UnkStruct1
+{
+    u16 var00;
+    u16 var02;
+    u8 var04;
+    u8 var05;
+    u8 var06;
+    s8 var07_0:5;
+    s8 var07_5:2;
+    s8 var07_7:1;
+};
+
+struct UnkStruct3
+{
+    u8 var00_0:7;
+    u8 var00_7:1;
+    u8 var01;
+    s8 var02;
+    s8 var03;
+    struct UnkStruct1 var04;
+};
+
+struct UnkStruct0
+{
+    u8 var00;
+    u8 var01;
+    u16 var02; //flag for each UnkStruct3
+    struct UnkStruct3 var04[0x10];
+};
+
+#endif // GUARD_ROULETTE_H
diff --git a/include/roulette_util.h b/include/roulette_util.h
index f59c4e44c..964f551fe 100644
--- a/include/roulette_util.h
+++ b/include/roulette_util.h
@@ -1,17 +1,46 @@
 #ifndef GUARD_ROULETTE_UTIL_H
 #define GUARD_ROULETTE_UTIL_H
 
+struct InnerStruct203CF18_3
+{
+    u16 unk0;
+    u16 unk2;
+    u8 unk4;
+    u8 unk5;
+    u8 unk6;
+    s8 unk7_0:4;
+    s8 unk7_4:2;
+    s8 unk7_6:1;
+    s8 unk7_7:1;
+};
+
+struct InnerStruct203CF18_2
+{
+    u8 unk0;
+    u8 unk1_0:4;
+    u8 unk1_4:1;
+    s8 unk1_5:1;
+    s8 unk1_6:1;
+    u32 unk1_7:1;
+    u8 unk2;
+    u8 unk3;
+    struct InnerStruct203CF18_3 unk4;
+};
+
 // structures
 struct InnerStruct203CF18
 {
-    u8 filler[0xC4];
+    u16 unk0;
+    struct InnerStruct203CF18_2 unk4[16];
 };
 
-void sub_8151B68(struct InnerStruct203CF18 *, const u8*);
+int sub_8151B68(struct InnerStruct203CF18 *, const struct InnerStruct203CF18_3 *);
 void sub_8151B3C(struct InnerStruct203CF18 *);
-void sub_8151CA8(struct InnerStruct203CF18 *, u8, u8);
-void sub_8151C50(struct InnerStruct203CF18 *, u8, u8);
-void sub_8151D28(struct InnerStruct203CF18 *, u8, u8);
+void sub_8151CA8(struct InnerStruct203CF18 *, u16, u8);
+void sub_8151C50(struct InnerStruct203CF18 *, u16, u8);
+void sub_8151D28(struct InnerStruct203CF18 *, u16, u8);
 void sub_8151E50(struct InnerStruct203CF18 *);
+void sub_8152008(u16 *dest, u16 src, u8 left, u8 top, u8 width, u8 height);
+void sub_8152058(u16 *dest, u16 *src, u8 left, u8 top, u8 width, u8 height);
 
 #endif // GUARD_ROULETTE_UTIL_H
diff --git a/ld_script.txt b/ld_script.txt
index ddafe6ecf..1e0fc6a0d 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -214,7 +214,7 @@ SECTIONS {
         src/battle_message.o(.text);
         asm/cable_car.o(.text);
         src/math_util.o(.text);
-        asm/roulette_util.o(.text);
+        src/roulette_util.o(.text);
         src/rom_81520A8.o(.text);
         src/save.o(.text);
         src/mystery_event_script.o(.text);
diff --git a/src/fldeff_groundshake.c b/src/fldeff_groundshake.c
index e9a46bb86..73d72c8b6 100644
--- a/src/fldeff_groundshake.c
+++ b/src/fldeff_groundshake.c
@@ -32,7 +32,17 @@ static void sub_81BEA20(void);
 static void sub_81BEAD8(struct Sprite* sprite);
 
 // rodata
-static const u8 gUnknown_08617E18[] = {0x3b, 0x43, 0x61, 0x00, 0x0f, 0x05, 0xff, 0x9b};
+const struct InnerStruct203CF18_3 gUnknown_08617E18 = {
+    .unk0 = 0x433b,
+    .unk2 = 0x61,
+    .unk4 = 0x0F,
+    .unk5 = 0x05,
+    .unk6 = 0xFF,
+    .unk7_0 = 0xB,
+    .unk7_4 = 0x1,
+    .unk7_6 = 0,
+    .unk7_7 = 1,
+};
 
 static const union AnimCmd gSpriteAnim_8617E20[] =
 {
@@ -131,7 +141,7 @@ void sub_81BE6B8(void)
 
     gUnknown_0203CF18 = (struct Struct203CF18 *)AllocZeroed(sizeof(struct Struct203CF18));
     sub_8151B3C(&(gUnknown_0203CF18->unk4));
-    sub_8151B68(&(gUnknown_0203CF18->unk4), gUnknown_08617E18);
+    sub_8151B68(&(gUnknown_0203CF18->unk4), &gUnknown_08617E18);
     sub_8151CA8(&(gUnknown_0203CF18->unk4), 1, 1);
     gUnknown_0203CF18->taskId = CreateTask(sub_81BE698, 0xFF);
 }
diff --git a/src/roulette_util.c b/src/roulette_util.c
new file mode 100755
index 000000000..a197cfa09
--- /dev/null
+++ b/src/roulette_util.c
@@ -0,0 +1,700 @@
+#include "global.h"
+#include "palette.h"
+#include "roulette.h"
+#include "roulette_util.h"
+#include "util.h"
+
+void sub_8151678(struct UnkStruct0 *r0)
+{
+    r0->var00 = 0;
+    r0->var02 = 0;
+    memset(&r0->var04, 0, sizeof(r0->var04));
+}
+
+u8 sub_815168C(struct UnkStruct0 *r0, u8 r1, struct UnkStruct1 *r2)
+{
+    if (!(r1 < 16) || (r0->var04[r1].var00_7))
+        return 0xFF;
+
+    r0->var04[r1].var04.var00 = r2->var00;
+    r0->var04[r1].var04.var02 = r2->var02;
+    r0->var04[r1].var04.var04 = r2->var04;
+    r0->var04[r1].var04.var05 = r2->var05;
+    r0->var04[r1].var04.var06 = r2->var06;
+    r0->var04[r1].var04.var07_0 = r2->var07_0;
+    r0->var04[r1].var04.var07_5 = r2->var07_5;
+    r0->var04[r1].var04.var07_7 = r2->var07_7;
+    r0->var04[r1].var00_0 = 0;
+    r0->var04[r1].var00_7 = 1;
+    r0->var04[r1].var02 = 0;
+    r0->var04[r1].var01 = 0;
+    if (r0->var04[r1].var04.var07_7 < 0)
+        r0->var04[r1].var03 = 0xFF;
+    else
+        r0->var04[r1].var03 = 1;
+
+    return r1;
+}
+
+u8 sub_8151710(struct UnkStruct0 *r0, u8 r1)
+{
+    if (r1 >= 16)
+        return 0xFF;
+    if (!r0->var04[r1].var00_7)
+        return 0xFF;
+
+    memset(&r0->var04[r1], 0, sizeof(r0->var04[r1]));
+    return r1;
+}
+
+u8 sub_8151744(struct UnkStruct3 *r0)
+{
+    u8 i;
+    u8 returnval;
+
+    for (i = 0; i < r0->var04.var04; i++)
+    {
+        struct PlttData *faded =   (struct PlttData *)&gPlttBufferFaded[r0->var04.var02 + i];
+        struct PlttData *unfaded = (struct PlttData *)&gPlttBufferUnfaded[r0->var04.var02 + i];
+
+        switch (r0->var00_0)
+        {
+        case 1:
+            if (faded->r + r0->var03 >= 0 && faded->r + r0->var03 < 32)
+                faded->r += r0->var03;
+            if (faded->g + r0->var03 >= 0 && faded->g + r0->var03 < 32)
+                faded->g += r0->var03;
+            if (faded->b + r0->var03 >= 0 && faded->b + r0->var03 < 32)
+                faded->b += r0->var03;
+            break;
+        case 2:
+            if (r0->var03 < 0)
+            {
+                if (faded->r + r0->var03 >= unfaded->r)
+                    faded->r += r0->var03;
+                if (faded->g + r0->var03 >= unfaded->g)
+                    faded->g += r0->var03;
+                if (faded->b + r0->var03 >= unfaded->b)
+                    faded->b += r0->var03;
+            }
+            else
+            {
+                if (faded->r + r0->var03 <= unfaded->r)
+                    faded->r += r0->var03;
+                if (faded->g + r0->var03 <= unfaded->g)
+                    faded->g += r0->var03;
+                if (faded->b + r0->var03 <= unfaded->b)
+                    faded->b += r0->var03;
+            }
+            break;
+        }
+    }
+    if ((u32)r0->var02++ != r0->var04.var07_0)
+    {
+        returnval = 0;
+    }
+    else
+    {
+        r0->var02 = 0;
+        r0->var03 *= -1;
+        if (r0->var00_0 == 1)
+            r0->var00_0++;
+        else
+            r0->var00_0--;
+        returnval = 1;
+    }
+    return returnval;
+}
+
+u8 sub_815194C(struct UnkStruct3 *r0)
+{
+    u8 rg2 = 0;
+
+    switch (r0->var00_0)
+    {
+    case 1:
+        for (rg2 = 0; rg2 < r0->var04.var04; rg2++)
+            gPlttBufferFaded[r0->var04.var02 + rg2] = r0->var04.var00;
+        r0->var00_0++;
+        break;
+    case 2:
+        for (rg2 = 0; rg2 < r0->var04.var04; rg2++)
+            gPlttBufferFaded[r0->var04.var02 + rg2] = gPlttBufferUnfaded[r0->var04.var02 + rg2];
+        r0->var00_0--;
+        break;
+    }
+    return 1;
+}
+
+void task_tutorial_controls_fadein(struct UnkStruct0 *r0)
+{
+    u8 i = 0;
+
+    if (r0->var00)
+    {
+        for (i = 0; i < 16; i++)
+        {
+            if ((r0->var02 >> i) & 1)
+            {
+                if (--r0->var04[i].var01 == 0xFF) // if underflow ?
+                {
+                    if (r0->var04[i].var04.var00 & 0x8000) // PlttData->unused_15 ?
+                        sub_8151744(&r0->var04[i]);
+                    else
+                        sub_815194C(&r0->var04[i]);
+
+                    r0->var04[i].var01 = r0->var04[i].var04.var05;
+                }
+            }
+        }
+    }
+}
+
+void sub_8151A48(struct UnkStruct0 *r0, u16 r1)
+{
+    u8 i = 0;
+
+    r0->var00++;
+    for (i = 0; i < 16; i++)
+    {
+        if ((r1 >> i) & 1)
+        {
+            if (r0->var04[i].var00_7)
+            {
+                r0->var02 |= 1 << i;
+                r0->var04[i].var00_0 = 1;
+            }
+        }
+    }
+}
+
+void sub_8151A9C(struct UnkStruct0 *r0, u16 r1)
+{
+    u8 i;
+
+    for (i = 0; i < 16; i++)
+    {
+        if ((r0->var02 >> i) & 1)
+        {
+            if (r0->var04[i].var00_7)
+            {
+                if ((r1 >> i) & 1)
+                {
+                    u32 offset = r0->var04[i].var04.var02;
+                    u16 *faded = &gPlttBufferFaded[offset];
+                    u16 *unfaded = &gPlttBufferUnfaded[offset];
+                    memcpy(faded, unfaded, r0->var04[i].var04.var04 * 2);
+                    r0->var04[i].var00_0 = 0;
+                    r0->var04[i].var02 = 0;
+                    r0->var04[i].var01 = 0;
+                    if (r0->var04[i].var04.var07_7 < 0)
+                        r0->var04[i].var03 = 0xFF;
+                    else
+                        r0->var04[i].var03 = 0x1;
+                }
+            }
+        }
+    }
+    if (r1 == 0xFFFF)
+    {
+        r0->var00 = 0;
+        r0->var02 = 0;
+    }
+    else
+    {
+        r0->var02 = r0->var02 & ~r1;
+    }
+}
+
+void sub_8151B3C(struct InnerStruct203CF18 *arg0)
+{
+    u8 i = 0;
+    arg0->unk0 = 0;
+    memset(&arg0->unk4, 0, sizeof(arg0->unk4));
+    for (; i < 16; i++)
+    {
+        arg0->unk4[i].unk0 = i;
+    }
+}
+
+int sub_8151B68(struct InnerStruct203CF18 *arg0, const struct InnerStruct203CF18_3 *arg1)
+{
+    u8 i = 0;
+    struct InnerStruct203CF18_2 *r4 = NULL;
+
+    if (!arg0->unk4[0].unk1_7)
+    {
+        r4 = &arg0->unk4[0];
+    }
+    else
+    {
+        while (++i < 16)
+        {
+            if (!arg0->unk4[i].unk1_7)
+            {
+                r4 = &arg0->unk4[i];
+                break;
+            }
+        }
+    }
+
+    if (r4 == 0)
+        return 0xFF;
+    
+    r4->unk1_0 = 0;
+    r4->unk1_4 = 0;
+    r4->unk1_6 = 1;
+    r4->unk1_7 = 1;
+    r4->unk2 = 0;
+    r4->unk3 = 0;
+    memcpy(&r4->unk4, arg1, sizeof(*arg1));
+    return i;
+}
+
+void sub_8151BD4(struct InnerStruct203CF18_2 *arg0)
+{
+    u16 i;
+
+    if (!arg0->unk1_6 && arg0->unk4.unk7_6)
+    {
+        for (i = arg0->unk4.unk2; i < arg0->unk4.unk2 + arg0->unk4.unk4; i++)
+            gPlttBufferFaded[i] = gPlttBufferUnfaded[i];
+    }
+
+    memset(&arg0->unk4, 0, sizeof(arg0->unk4));
+    arg0->unk1_0 = 0;
+    arg0->unk1_4 = 0;
+    arg0->unk1_5 = 0;
+    arg0->unk1_6 = 1;
+    arg0->unk1_7 = 0;
+    arg0->unk3 = 0;
+    arg0->unk2 = 0;
+}
+
+void sub_8151C50(struct InnerStruct203CF18 *arg0, u16 arg1, u8 arg2)
+{
+    u16 i = 0;
+
+    if (!arg2)
+    {
+        sub_8151BD4(&arg0->unk4[arg1 & 0xF]);
+    }
+    else
+    {
+        for (i = 0; i < 16; i++)
+        {
+            if ((arg1 & 1) && arg0->unk4[i].unk1_7)
+                sub_8151BD4(&arg0->unk4[i]);
+
+            arg1 >>= 1;
+        }
+    }
+}
+
+// there seems to be a temp var involved inside the first if block
+void sub_8151CA8(struct InnerStruct203CF18 *arg0, u16 arg1, u8 arg2)
+{
+    u8 i = 0;
+
+    if (!arg2)
+    {
+        i = arg1 & 0xF;
+        arg0->unk4[i].unk1_6 = 0;
+        arg0->unk0 |= 1 << i;
+    }
+    else
+    {
+        for (i = 0; i < 16; i++)
+        {
+            if (!(arg1 & 1) || !arg0->unk4[i].unk1_7 || !arg0->unk4[i].unk1_6)
+            {
+                arg1 <<= 1;
+            }
+            else
+            {
+                arg0->unk4[i].unk1_6 = 0;
+                arg0->unk0 |= 1 << i;
+            }
+        }
+    }    
+}
+
+void sub_8151D28(struct InnerStruct203CF18 *arg0, u16 arg1, u8 arg2)
+{
+    u16 i;
+    struct InnerStruct203CF18_2 *var0;
+    u8 j = 0;
+
+    if (!arg2)
+    {
+        var0 = &arg0->unk4[arg1 & 0xF];
+        if (!var0->unk1_6 && var0->unk1_7)
+        {
+            if (var0->unk4.unk7_6)
+            {
+                for (i = var0->unk4.unk2; i < var0->unk4.unk2 + var0->unk4.unk4; i++)
+                    gPlttBufferFaded[i] = gPlttBufferUnfaded[i];
+            }
+
+            var0->unk1_6 = 1;
+            arg0->unk0 &= ~(1 << j);
+        }
+    }
+    else
+    {
+        for (j = 0; j < 16; j++)
+        {
+            var0 = &arg0->unk4[j];
+            if (!(arg1 & 1) || var0->unk1_6 || !var0->unk1_7)
+            {
+                arg1 <<= 1;
+            }
+            else
+            {
+                if (var0->unk4.unk7_6)
+                {
+                    for (i = var0->unk4.unk2; i < var0->unk4.unk2 + var0->unk4.unk4; i++)
+                        gPlttBufferFaded[i] = gPlttBufferUnfaded[i];
+                }
+
+                var0->unk1_6 = 1;
+                arg0->unk0 &= ~(1 << j);
+            }
+        }
+    }
+}
+
+#ifdef NONMATCHING
+void sub_8151E50(struct InnerStruct203CF18 *arg0)
+{
+    struct InnerStruct203CF18_2 *var0;
+    u8 i = 0;
+
+    if (arg0->unk0)
+    {
+        for (i = 0; i < 16; i++)
+        {
+            var0 = &arg0->unk4[i];
+            if ((!var0->unk1_6 && var0->unk1_7) && (!gPaletteFade.active || !var0->unk4.unk7_7))
+            {
+                if (--var0->unk2 == 0xFF)
+                {
+                    var0->unk2 = var0->unk4.unk5;
+                    BlendPalette(var0->unk4.unk2, var0->unk4.unk4, var0->unk1_0, var0->unk4.unk0);
+                    switch (var0->unk4.unk7_4)
+                    {
+                    case 0:
+                        if (var0->unk1_0++ == var0->unk4.unk7_0)
+                        {
+                            var0->unk3++;
+                            var0->unk1_0 = 0;
+                        }
+                        break;
+                    case 1:
+                        if (var0->unk1_4)
+                        {
+                            if (--var0->unk1_0 == 0)
+                            {
+                                var0->unk3++;
+                                var0->unk1_4 ^= 1;
+                            }
+                        }
+                        else
+                        {
+                            if (var0->unk1_0++ == var0->unk4.unk7_0 - 1)
+                            {
+                                var0->unk3++;
+                                var0->unk1_4 ^= 1;
+                            }
+                        }
+                        break;
+                    case 2:
+                        if (var0->unk1_4)
+                            var0->unk1_0 = 0;
+                        else
+                            var0->unk1_0 = var0->unk4.unk7_0;
+                        
+                        var0->unk1_4 ^= 1;
+                        var0->unk3++;
+                        break;
+                    }
+
+                    if (var0->unk4.unk6 != 0xFF && var0->unk3 == 0xFF)
+                        sub_8151D28(arg0, var0->unk0, 0);
+                }
+            }
+        }
+    }
+}
+#else
+NAKED
+void sub_8151E50(struct InnerStruct203CF18 *arg0)
+{
+    asm_unified("\n\
+    push {r4-r7,lr}\n\
+    mov r7, r10\n\
+    mov r6, r9\n\
+    mov r5, r8\n\
+    push {r5-r7}\n\
+    sub sp, 0x4\n\
+    str r0, [sp]\n\
+    movs r0, 0\n\
+    mov r10, r0\n\
+    ldr r1, [sp]\n\
+    ldrh r0, [r1]\n\
+    cmp r0, 0\n\
+    bne _08151E6C\n\
+    b _08151FF6\n\
+_08151E6C:\n\
+    movs r2, 0xF\n\
+    mov r9, r2\n\
+    movs r3, 0x10\n\
+    negs r3, r3\n\
+    mov r8, r3\n\
+    movs r7, 0x1\n\
+_08151E78:\n\
+    mov r5, r10\n\
+    lsls r0, r5, 1\n\
+    add r0, r10\n\
+    lsls r0, 2\n\
+    adds r0, 0x4\n\
+    ldr r1, [sp]\n\
+    adds r4, r1, r0\n\
+    ldrb r2, [r4, 0x1]\n\
+    movs r3, 0xC0\n\
+    ands r3, r2\n\
+    cmp r3, 0x80\n\
+    beq _08151E92\n\
+    b _08151FE6\n\
+_08151E92:\n\
+    ldr r0, =gPaletteFade\n\
+    ldrb r1, [r0, 0x7]\n\
+    adds r0, r3, 0\n\
+    ands r0, r1\n\
+    cmp r0, 0\n\
+    beq _08151EA8\n\
+    ldrb r0, [r4, 0xB]\n\
+    ands r3, r0\n\
+    cmp r3, 0\n\
+    beq _08151EA8\n\
+    b _08151FE6\n\
+_08151EA8:\n\
+    ldrb r0, [r4, 0x2]\n\
+    subs r0, 0x1\n\
+    strb r0, [r4, 0x2]\n\
+    lsls r0, 24\n\
+    lsrs r0, 24\n\
+    cmp r0, 0xFF\n\
+    beq _08151EB8\n\
+    b _08151FE6\n\
+_08151EB8:\n\
+    ldrb r0, [r4, 0x9]\n\
+    strb r0, [r4, 0x2]\n\
+    ldrh r0, [r4, 0x6]\n\
+    ldrb r1, [r4, 0x8]\n\
+    lsls r2, 28\n\
+    lsrs r2, 28\n\
+    ldrh r3, [r4, 0x4]\n\
+    bl BlendPalette\n\
+    ldrb r5, [r4, 0xB]\n\
+    lsls r0, r5, 26\n\
+    asrs r0, 30\n\
+    cmp r0, 0x1\n\
+    beq _08151F16\n\
+    cmp r0, 0x1\n\
+    bgt _08151EE4\n\
+    cmp r0, 0\n\
+    beq _08151EEA\n\
+    b _08151FD0\n\
+    .pool\n\
+_08151EE4:\n\
+    cmp r0, 0x2\n\
+    beq _08151F92\n\
+    b _08151FD0\n\
+_08151EEA:\n\
+    ldrb r2, [r4, 0x1]\n\
+    lsls r1, r2, 28\n\
+    lsrs r0, r1, 28\n\
+    adds r0, 0x1\n\
+    mov r3, r9\n\
+    ands r0, r3\n\
+    mov r6, r8\n\
+    adds r3, r6, 0\n\
+    ands r3, r2\n\
+    orrs r3, r0\n\
+    strb r3, [r4, 0x1]\n\
+    lsrs r1, 28\n\
+    lsls r0, r5, 28\n\
+    asrs r0, 28\n\
+    cmp r1, r0\n\
+    bne _08151FD0\n\
+    ldrb r0, [r4, 0x3]\n\
+    adds r0, 0x1\n\
+    strb r0, [r4, 0x3]\n\
+    ands r3, r6\n\
+    strb r3, [r4, 0x1]\n\
+    b _08151FD0\n\
+_08151F16:\n\
+    ldrb r3, [r4, 0x1]\n\
+    movs r0, 0x10\n\
+    ands r0, r3\n\
+    cmp r0, 0\n\
+    beq _08151F54\n\
+    lsls r0, r3, 28\n\
+    lsrs r0, 28\n\
+    subs r0, 0x1\n\
+    mov r5, r9\n\
+    ands r0, r5\n\
+    mov r2, r8\n\
+    ands r2, r3\n\
+    orrs r2, r0\n\
+    strb r2, [r4, 0x1]\n\
+    cmp r0, 0\n\
+    bne _08151FD0\n\
+    ldrb r0, [r4, 0x3]\n\
+    adds r0, 0x1\n\
+    strb r0, [r4, 0x3]\n\
+    lsls r0, r2, 27\n\
+    lsrs r0, 31\n\
+    eors r0, r7\n\
+    ands r0, r7\n\
+    lsls r0, 4\n\
+    movs r3, 0x11\n\
+    negs r3, r3\n\
+    adds r1, r3, 0\n\
+    ands r2, r1\n\
+    orrs r2, r0\n\
+    strb r2, [r4, 0x1]\n\
+    b _08151FD0\n\
+_08151F54:\n\
+    lsls r0, r5, 28\n\
+    asrs r0, 28\n\
+    subs r0, 0x1\n\
+    mov r5, r9\n\
+    ands r0, r5\n\
+    lsls r2, r3, 28\n\
+    lsrs r1, r2, 28\n\
+    adds r1, 0x1\n\
+    ands r1, r5\n\
+    mov r5, r8\n\
+    ands r3, r5\n\
+    orrs r3, r1\n\
+    strb r3, [r4, 0x1]\n\
+    lsrs r2, 28\n\
+    cmp r2, r0\n\
+    bne _08151FD0\n\
+    ldrb r0, [r4, 0x3]\n\
+    adds r0, 0x1\n\
+    strb r0, [r4, 0x3]\n\
+    lsls r0, r3, 27\n\
+    lsrs r0, 31\n\
+    eors r0, r7\n\
+    ands r0, r7\n\
+    lsls r0, 4\n\
+    movs r2, 0x11\n\
+    negs r2, r2\n\
+    adds r1, r2, 0\n\
+    ands r3, r1\n\
+    orrs r3, r0\n\
+    strb r3, [r4, 0x1]\n\
+    b _08151FD0\n\
+_08151F92:\n\
+    ldrb r2, [r4, 0x1]\n\
+    movs r0, 0x10\n\
+    ands r0, r2\n\
+    cmp r0, 0\n\
+    beq _08151FA2\n\
+    mov r0, r8\n\
+    ands r0, r2\n\
+    b _08151FB0\n\
+_08151FA2:\n\
+    lsls r1, r5, 28\n\
+    asrs r1, 28\n\
+    mov r3, r9\n\
+    ands r1, r3\n\
+    mov r0, r8\n\
+    ands r0, r2\n\
+    orrs r0, r1\n\
+_08151FB0:\n\
+    strb r0, [r4, 0x1]\n\
+    ldrb r2, [r4, 0x1]\n\
+    lsls r0, r2, 27\n\
+    lsrs r0, 31\n\
+    eors r0, r7\n\
+    ands r0, r7\n\
+    lsls r0, 4\n\
+    movs r5, 0x11\n\
+    negs r5, r5\n\
+    adds r1, r5, 0\n\
+    ands r2, r1\n\
+    orrs r2, r0\n\
+    strb r2, [r4, 0x1]\n\
+    ldrb r0, [r4, 0x3]\n\
+    adds r0, 0x1\n\
+    strb r0, [r4, 0x3]\n\
+_08151FD0:\n\
+    ldrb r1, [r4, 0xA]\n\
+    cmp r1, 0xFF\n\
+    beq _08151FE6\n\
+    ldrb r0, [r4, 0x3]\n\
+    cmp r0, r1\n\
+    bne _08151FE6\n\
+    ldrb r1, [r4]\n\
+    ldr r0, [sp]\n\
+    movs r2, 0\n\
+    bl sub_8151D28\n\
+_08151FE6:\n\
+    mov r0, r10\n\
+    adds r0, 0x1\n\
+    lsls r0, 24\n\
+    lsrs r0, 24\n\
+    mov r10, r0\n\
+    cmp r0, 0xF\n\
+    bhi _08151FF6\n\
+    b _08151E78\n\
+_08151FF6:\n\
+    add sp, 0x4\n\
+    pop {r3-r5}\n\
+    mov r8, r3\n\
+    mov r9, r4\n\
+    mov r10, r5\n\
+    pop {r4-r7}\n\
+    pop {r0}\n\
+    bx r0");
+}
+#endif // NONMATCHING
+
+void sub_8152008(u16 *dest, u16 src, u8 left, u8 top, u8 width, u8 height)
+{
+    u16 *_dest;
+    u8 i;
+    u8 j;
+    i = 0;
+    dest = &dest[top * 32 + left];
+    for (; i < height; i++)
+    {
+        _dest = dest + i * 32;
+        for (j = 0; j < width; j++)
+        {
+            *_dest++ = src;
+        }
+    }
+}
+
+void sub_8152058(u16 *dest, u16 *src, u8 left, u8 top, u8 width, u8 height)
+{
+    u16 *_dest;
+    u16 *_src = src;
+    u8 i;
+    u8 j;
+    i = 0;
+    dest = &dest[top * 32 + left];
+    for (; i < height; i++)
+    {
+        _dest = dest + i * 32;
+        for (j = 0; j < width; j++)
+        {
+            *_dest++ = *_src++;
+        }
+    }
+}