Hit and break the hollow glass ball with a solid one or the solid ball is broken when hit on other surface. Strategy is required.

Pan to left or right to rotate. To shoot ball, pull the brown piston behind the ball down (the further down will shoot with more power) to the maximum ring at the bottom of the cannon.

At the beginning of the first level, a demo show is present. The pan to rotate and shooting are disabled during the demo and will be abled at the end of the demo.

It is a casual and strategic game.