click on the green flag to restart. with your mouse, move it, and the stars will follow leaving some scribbles! press the space , then you will see you scribble! If you want the stars, click the up arrow,if you don't click the down arrow.
mobile friendly, you can just tap the screen. if you don't want the line to go up to the green flag, click quickly. if you have a keyboard, the lines come quicker.