diff --git a/builtins.ts b/builtins.ts
new file mode 100644
index 0000000..495f08e
--- /dev/null
+++ b/builtins.ts
@@ -0,0 +1,59 @@
+import {
+	setPixelsInRect,
+	clearScreen,
+} from "./window.ts";
+import { font } from "./font.ts";
+
+// deno-fmt-ignore
+const sprites = [
+	[
+		2, 2, 2, 2, 2, 2, 2, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 2, 2, 2, 2, 2, 2, 2,
+	],
+	[
+		2, 2, 2, 2, 2, 2, 2, 2,
+		2, 3, 3, 1, 1, 3, 3, 2,
+		2, 3, 3, 1, 1, 3, 3, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 1, 1, 1, 1, 1, 1, 2,
+		2, 3, 3, 1, 1, 3, 3, 2,
+		2, 3, 3, 1, 1, 3, 3, 2,
+		2, 2, 2, 2, 2, 2, 2, 2,
+	],
+	[
+		2, 2, 2, 2, 2, 2, 2, 2,
+		2, 4, 4, 4, 4, 5, 5, 2,
+		2, 4, 4, 4, 5, 5, 5, 2,
+		2, 4, 4, 5, 5, 5, 6, 2,
+		2, 4, 5, 5, 5, 6, 6, 2,
+		2, 5, 5, 5, 6, 6, 6, 2,
+		2, 5, 5, 6, 6, 6, 6, 2,
+		2, 2, 2, 2, 2, 2, 2, 2,
+	],
+]
+
+const drawSprite = (x: number, y: number, spr: number) => {
+	setPixelsInRect(x, y, 8, sprites[spr]);
+}
+
+const drawChar = (x: number, y: number, char: string) => {
+	setPixelsInRect(x, y, 4, font[char]);
+}
+
+const drawText = (x: number, y: number, text: string) => {
+	[...text].forEach((char, i) => {
+		drawChar(x+4*i, y, char);
+	});
+}
+
+export default {
+	clearScreen,
+	drawSprite,
+	drawText,
+}
\ No newline at end of file
diff --git a/font.ts b/font.ts
new file mode 100644
index 0000000..32e426f
--- /dev/null
+++ b/font.ts
@@ -0,0 +1,259 @@
+// deno-fmt-ignore
+export const font: {[key: string]: Array<number>} = {
+	"a": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"b": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+	],
+	"c": [
+		0, 0, 0, 0,
+		0, 0, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+		0, 0, 1, 1,
+	],
+	"d": [
+		0, 0, 0, 0,
+		0, 1, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+	],
+	"e": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 1, 0,
+		0, 1, 0, 0,
+		0, 1, 1, 1,
+	],
+	"f": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 1, 0,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+	],
+	"g": [
+		0, 0, 0, 0,
+		0, 0, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 0, 1, 1,
+	],
+	"h": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"i": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 1, 1, 1,
+	],
+	"j": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 1, 1, 0,
+	],
+	"k": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"l": [
+		0, 0, 0, 0,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+		0, 1, 1, 1,
+	],
+	"m": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"n": [
+		0, 0, 0, 0,
+		0, 1, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"o": [
+		0, 0, 0, 0,
+		0, 0, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+	],
+	"p": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 0, 0,
+	],
+	"q": [
+		0, 0, 0, 0,
+		0, 0, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+		0, 0, 1, 1,
+	],
+	"r": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"s": [
+		0, 0, 0, 0,
+		0, 0, 1, 1,
+		0, 1, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 0, 1,
+		0, 1, 1, 0,
+	],
+	"t": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+		0, 0, 1, 0,
+	],
+	"u": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 0,
+	],
+	"v": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 0, 1, 0,
+	],
+	"w": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 1, 1, 1,
+	],
+	"x": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 0, 1, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+	],
+	"y": [
+		0, 0, 0, 0,
+		0, 1, 0, 1,
+		0, 1, 0, 1,
+		0, 1, 1, 1,
+		0, 0, 1, 0,
+		0, 1, 0, 0,
+	],
+	"z": [
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 0, 1,
+		0, 0, 1, 0,
+		0, 1, 0, 0,
+		0, 1, 1, 1,
+	],
+	",": [
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 1, 0,
+		0, 1, 0, 0,
+	],
+	".": [
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 1, 0,
+	],
+	" ": [
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+	],
+	"<": [
+		0, 0, 0, 0,
+		0, 0, 0, 1,
+		0, 0, 1, 0,
+		0, 1, 0, 0,
+		0, 0, 1, 0,
+		0, 0, 0, 1,
+	],
+	">": [
+		0, 0, 0, 0,
+		0, 1, 0, 0,
+		0, 0, 1, 0,
+		0, 0, 0, 1,
+		0, 0, 1, 0,
+		0, 1, 0, 0,
+	],
+	"=": [
+		0, 0, 0, 0,
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 0, 0,
+		0, 1, 1, 1,
+		0, 0, 0, 0,
+	],
+}
\ No newline at end of file
diff --git a/game.ts b/game.ts
new file mode 100644
index 0000000..744c60c
--- /dev/null
+++ b/game.ts
@@ -0,0 +1,19 @@
+import faux from "./builtins.ts";
+
+let y = 0;
+
+export default {
+	init() {
+		
+	},
+	update() {
+		y++;
+		if (y>127) {
+			y=-5;
+		}
+	},
+	draw() {
+		faux.clearScreen();
+		faux.drawText(0, y, "hello, world");
+	},
+}
\ No newline at end of file
diff --git a/index.ts b/index.ts
index c07f3a5..4346b71 100644
--- a/index.ts
+++ b/index.ts
@@ -1,340 +1,14 @@
 import {
 	mainloop,
 	frame,
-	setPixelColor,
-	clearScreen,
-	setPixelsInRect,
 } from "./window.ts";
+import game from "./game.ts";
 
-// deno-fmt-ignore
-const sprites = [
-	[
-		2, 2, 2, 2, 2, 2, 2, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 2, 2, 2, 2, 2, 2, 2,
-	],
-	[
-		2, 2, 2, 2, 2, 2, 2, 2,
-		2, 3, 3, 1, 1, 3, 3, 2,
-		2, 3, 3, 1, 1, 3, 3, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 1, 1, 1, 1, 1, 1, 2,
-		2, 3, 3, 1, 1, 3, 3, 2,
-		2, 3, 3, 1, 1, 3, 3, 2,
-		2, 2, 2, 2, 2, 2, 2, 2,
-	],
-	[
-		2, 2, 2, 2, 2, 2, 2, 2,
-		2, 4, 4, 4, 4, 5, 5, 2,
-		2, 4, 4, 4, 5, 5, 5, 2,
-		2, 4, 4, 5, 5, 5, 6, 2,
-		2, 4, 5, 5, 5, 6, 6, 2,
-		2, 5, 5, 5, 6, 6, 6, 2,
-		2, 5, 5, 6, 6, 6, 6, 2,
-		2, 2, 2, 2, 2, 2, 2, 2,
-	],
-]
-
-// deno-fmt-ignore
-const font: {[key: string]: Array<number>} = {
-	"a": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"b": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-	],
-	"c": [
-		0, 0, 0, 0,
-		0, 0, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-		0, 0, 1, 1,
-	],
-	"d": [
-		0, 0, 0, 0,
-		0, 1, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-	],
-	"e": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 1, 0,
-		0, 1, 0, 0,
-		0, 1, 1, 1,
-	],
-	"f": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 1, 0,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-	],
-	"g": [
-		0, 0, 0, 0,
-		0, 0, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 0, 1, 1,
-	],
-	"h": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"i": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 1, 1, 1,
-	],
-	"j": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 1, 1, 0,
-	],
-	"k": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"l": [
-		0, 0, 0, 0,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-		0, 1, 1, 1,
-	],
-	"m": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"n": [
-		0, 0, 0, 0,
-		0, 1, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"o": [
-		0, 0, 0, 0,
-		0, 0, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-	],
-	"p": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 0, 0,
-	],
-	"q": [
-		0, 0, 0, 0,
-		0, 0, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-		0, 0, 1, 1,
-	],
-	"r": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"s": [
-		0, 0, 0, 0,
-		0, 0, 1, 1,
-		0, 1, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 0, 1,
-		0, 1, 1, 0,
-	],
-	"t": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-		0, 0, 1, 0,
-	],
-	"u": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 0,
-	],
-	"v": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 0, 1, 0,
-	],
-	"w": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 1, 1, 1,
-	],
-	"x": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 0, 1, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-	],
-	"y": [
-		0, 0, 0, 0,
-		0, 1, 0, 1,
-		0, 1, 0, 1,
-		0, 1, 1, 1,
-		0, 0, 1, 0,
-		0, 1, 0, 0,
-	],
-	"z": [
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 0, 1,
-		0, 0, 1, 0,
-		0, 1, 0, 0,
-		0, 1, 1, 1,
-	],
-	",": [
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 1, 0,
-		0, 1, 0, 0,
-	],
-	".": [
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 1, 0,
-	],
-	" ": [
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-	],
-	"<": [
-		0, 0, 0, 0,
-		0, 0, 0, 1,
-		0, 0, 1, 0,
-		0, 1, 0, 0,
-		0, 0, 1, 0,
-		0, 0, 0, 1,
-	],
-	">": [
-		0, 0, 0, 0,
-		0, 1, 0, 0,
-		0, 0, 1, 0,
-		0, 0, 0, 1,
-		0, 0, 1, 0,
-		0, 1, 0, 0,
-	],
-	"=": [
-		0, 0, 0, 0,
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 0, 0,
-		0, 1, 1, 1,
-		0, 0, 0, 0,
-	],
-}
-
-const drawSprite = (x: number, y: number, spr: number) => {
-	setPixelsInRect(x, y, 8, sprites[spr]);
-}
-
-const drawChar = (x: number, y: number, char: string) => {
-	setPixelsInRect(x, y, 4, font[char]);
-}
-
-const drawText = (x: number, y: number, text: string) => {
-	[...text].forEach((char, i) => {
-		drawChar(x+4*i, y, char);
-	});
-}
-
-const draw = () => {
-	clearScreen();
-	drawText(5, 5, "=> hello, world <=");
-	drawText(5, 11, "the quick brown fox");
-	drawText(5, 17, "jumps over the lazy");
-	drawText(5, 23, "dog.");
-	// for (let i = 0; i < 256; i++) {
-	// 	drawSprite(Math.floor(Math.random()*120), Math.floor(Math.random()*120), 0);
-	// 	drawSprite(Math.floor(Math.random()*120), Math.floor(Math.random()*120), 1);
-	// 	drawSprite(Math.floor(Math.random()*120), Math.floor(Math.random()*120), 2);
-	// }
-	setPixelColor(0, 0, 3);
-	setPixelColor(0, 127, 4);
-	setPixelColor(127, 0, 5);
-	setPixelColor(127, 127, 6);
-}
-
-draw();
+game.init();
 
 await mainloop((t) => {
-	// console.log(t/1000);
-	draw();
+	// TODO: use t
+	game.update();
+	game.draw();
 	frame();
 });
diff --git a/window.ts b/window.ts
index c2c0635..be9e07f 100644
--- a/window.ts
+++ b/window.ts
@@ -138,6 +138,9 @@ const allPixelColors = new Float32Array(
 )
 
 export const setPixelColor = (x: number, y: number, color: number) => {
+	if (x < 0 || y < 0 || x > 127 || y > 127) {
+		return;
+	}
 	if (color !== 0) {
 		const col = c(color);
 		allPixelColors.set(col, 4*6*(128*y+x));