private void checkKeys() {
		if (Keyboard.typed(KeyEvent.VK_LEFT)) {
			moveTiles(Direction.LEFT);
			if (!hasStarted)
				hasStarted = true;
		}
		if (Keyboard.typed(KeyEvent.VK_RIGHT)) {
			moveTiles(Direction.RIGHT);
			if (!hasStarted)
				hasStarted = true;
		}
		if (Keyboard.typed(KeyEvent.VK_UP)) {
			moveTiles(Direction.UP);
			if (!hasStarted)
				hasStarted = true;
		}
		if (Keyboard.typed(KeyEvent.VK_DOWN)) {
			moveTiles(Direction.DOWN);
			if (!hasStarted)
				hasStarted = true;
		}
	}