diff --git a/tools/cheat-builder/asm/key_enable.s b/tools/cheat-builder/asm/key_enable.s
new file mode 100644
index 0000000..bfa507c
--- /dev/null
+++ b/tools/cheat-builder/asm/key_enable.s
@@ -0,0 +1,22 @@
+	.file	"key_input.c"
+	.text
+	.align	2
+	.global	_start
+	.type	_start,function
+
+_start:
+	mov	r0, #0x4000000
+	ldr	r0, [r0, #0x130]	@ r0 = read_io(0x4000130) 
+	ldrh	r1, [pc, #0x10]		@ r1 = 0x3ff
+	ldrh	r2, [pc, #0x0e]		@ r2 = 0x384 key:L+R+D+SEL
+	and	r0, r0, r2		@ r0 = r0 & 0x3ff
+	cmp	r0, r1			@ r0 == key
+	beq	_next   		@ if r0 == key then next else return
+	bx	lr
+
+_const:
+	.long	0x03ff0384
+
+_next:
+	.long	0
+
diff --git a/tools/cheat-builder/asm/key_onoff.s b/tools/cheat-builder/asm/key_onoff.s
new file mode 100644
index 0000000..a9d2c2f
--- /dev/null
+++ b/tools/cheat-builder/asm/key_onoff.s
@@ -0,0 +1,28 @@
+	.file	"key_onoff.c"
+	.text
+	.align	2
+	.global	_start
+	.type	_start,function
+
+_start:
+	mov	r0, #0x4000000
+	ldr	r0, [r0, #0x130]	@ r0 = read_io(0x4000130) 
+	ldrh	r1, [pc, #0x24]		@ r1 = 0x384 key:L+R+D+SEL 
+	ldrh	r2, [pc, #0x22]		@ r2 = 0x3ff
+	and	r0, r0, r2		@ r0 = r0 & 0x3ff
+	ldr	r2, [pc, #0x1c]		@ r2 = static_addr(isOn)
+	ldrb	r3, [r2]		@ r3 = *isOn
+	cmp	r0, r1
+	eoreq   r3, r3, #1		@ if r0 == key then *isOn = !r3
+	streqb	r3, [r2]
+	cmp	r3, #0
+	bne	_next   		@ if r3 != 0 then next else return
+	bx	lr
+
+_const:
+	.long	0x03ff0384
+	.long	0
+
+_next:
+	.long	0xFFFFFFFF
+