As usual Bart and Lisa are at odds with each other. Bart wants to go to the right, and Lisa wants to go to the left! The object is to move all of the Bart buttons to the right and all of the Lisa buttons to the left. You move a button by clicking on it. It either jumps over another button to an empty(space) button or moves one space over to an empty space. Bart can only move right and Lisa can only move left. Good luck!