If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Eliminate the evil Roly-Polys in each level. (killing friendly ones results in 10 points penalty). Use the mouse to aim. Move the mouse further away from the cannon to increase the power. Left click to fire. Finish the game in the least amount of shots to get a top score.
This game is played with mouse only.