diff --git a/builtins.ts b/builtins.ts
index 1384160..890da72 100644
--- a/builtins.ts
+++ b/builtins.ts
@@ -3,6 +3,7 @@ import {
 	clearScreen,
 } from "./window.ts";
 import { font } from "./font.ts";
+import { keyDown, keyPressed, keyReleased } from "./keyboard.ts";
 // import { codeSheet } from "./sheet.ts";
 
 // deno-fmt-ignore
@@ -57,6 +58,9 @@ const faux = {
 	clear_screen: clearScreen,
 	draw_sprite: drawSprite,
 	draw_text: drawText,
+	key_down: keyDown,
+	key_pressed: keyPressed,
+	key_released: keyReleased,
 	// code_sheet: codeSheet,
 };
 
diff --git a/index.ts b/index.ts
index 1b107fc..69496f0 100644
--- a/index.ts
+++ b/index.ts
@@ -3,14 +3,25 @@ import {
 	frame,
 } from "./window.ts";
 import { codeSheet } from "./sheet.ts";
+import { refreshKeyboard } from "./keyboard.ts";
+import { repl } from "./repl.ts";
 
 const game = codeSheet(0);
 
 game.init();
 
+let mode: "play" | "edit" = "edit";
+  
 await mainloop((_t) => {
 	// TODO: use t
-	game.update();
-	game.draw();
-	frame();
+	if (mode === "play") {
+		game.update();
+		game.draw();
+		frame();
+	} else if (mode === "edit") {
+		repl.update();
+		repl.draw();
+		frame();
+	}
+	refreshKeyboard();
 });
diff --git a/keyboard.ts b/keyboard.ts
new file mode 100644
index 0000000..106e283
--- /dev/null
+++ b/keyboard.ts
@@ -0,0 +1,84 @@
+const keyboard = new Map<string, {first: boolean, repeat: boolean, held: boolean}>();
+
+export const K = {
+	ESCAPE: 256,
+	ENTER: 257,
+	TAB: 258,
+	BACKSPACE: 259,
+	DELETE: 261,
+	ARROW_RIGHT: 262,
+	ARROW_LEFT: 263,
+	ARROW_DOWN: 264,
+	ARROW_UP: 265,
+	CAPS_LOCK: 280,
+	F1: 290,
+	F2: 291,
+	F3: 292,
+	F4: 293,
+	F5: 294,
+	F6: 295,
+	F7: 296,
+	F8: 297,
+	F9: 298,
+	F10: 299,
+	F11: 300,
+	F12: 301,
+	SHIFT_LEFT: 340,
+	CTRL_LEFT: 341,
+	ALT_LEFT: 342,
+	SHIFT_RIGHT: 344,
+	CTRL_RIGHT: 345,
+	ALT_RIGHT: 346,
+}
+
+addEventListener("keydown", (evt) => {
+	console.log("keydown", evt.key, evt.key.charCodeAt(0));
+	const isRepeat = keyboard.has(evt.key) && keyboard.get(evt.key)?.held!;
+	keyboard.set(evt.key, {
+		first: !isRepeat,
+		repeat: isRepeat,
+		held: true,
+	});
+});
+
+addEventListener("keyup", (evt) => {
+	console.log("keyup", evt.key, evt.key.charCodeAt(0));
+	keyboard.set(evt.key, {
+		first: false,
+		repeat: false,
+		held: false,
+	});
+});
+
+export const refreshKeyboard = () => {
+	keyboard.forEach(({held}, key) => {
+		if (!held) {
+			keyboard.delete(key);
+		} else {
+			keyboard.set(key, {
+				first: false,
+				repeat: false,
+				held: true,
+			});
+		}
+	})
+}
+
+export const keyPressed = (key: string) => {
+	return keyboard.has(key) && keyboard.get(key)?.repeat!;
+}
+
+export const keyDown = (key: string) => {
+	return keyboard.has(key) && keyboard.get(key)?.held!;
+}
+
+export const keyReleased = (key: string) => {
+	return keyboard.has(key) && !keyboard.get(key)?.held!;
+}
+
+export const getKeysPressed = () => {
+	const result = [...keyboard.entries()].filter(([_key, value]) => {
+		return value.first || value.repeat;
+	}).map(([key]) => key);
+	return result;
+}
\ No newline at end of file
diff --git a/repl.ts b/repl.ts
new file mode 100644
index 0000000..8543588
--- /dev/null
+++ b/repl.ts
@@ -0,0 +1,23 @@
+import faux from "./builtins.ts";
+import { getKeysPressed } from "./keyboard.ts";
+import { font } from "./font.ts";
+
+let line = "";
+
+const update = () => {
+	for (const key of getKeysPressed()) {
+		const char = key.toLowerCase();
+		if (char in font) {
+			line += char;
+		}
+	}
+}
+
+const draw = () => {
+	faux.clear_screen();
+	faux.draw_text(0, 0, "> "+line);
+}
+
+export const repl = {
+	update, draw
+}
\ No newline at end of file