Swing your ball around using the mouse, and try to smash all the black balls of screen. Your aim is to protect the white ball in the middle. If the white ball leaves the boundary, the game over. Every 10 levels you'll face a boss that you have to continually hit until he runs out of health and goes off screen. As you hit each ball out you gain experience points. The harder you hit the ball, the more experience you collect. At the end of each level you can spend this experience on one or more upgrades.