Move your mouse to help Steve eat cookies. Score enough points to get to the next level, but be careful to avoid bombs, angry faces, and red walls. You'll find plenty of bonuses to help you - see the HELP screen for a full list of items. The time limit is only 10 seconds, so you'll want to pick up plenty of yellow and red time bonuses.
A prize of two bonus games awaits anyone skilled enough to beat all three levels. Keep trying.