Simple single tap knock down game where you hit cans with cannon balls. There are 40 waving green cans spread across 20 levels and your aim is to hit and knock down the cans with balls you fire from the cannon. Move the cannon ball trajectory to where you think it will hit a can. The cannon will fire when you lift your finger. The numer of cannon balls you have left is in the bottom left of the screen. Hit the gold ball button to get a mega heavy gold ball which will knock down lots of objects and the king can. If you run out of balls you can hit the white ball button to watch a reward ad and get some more. You start with 10 cannon balls and get another 3 each time you successfully complete a level. You complete a level when you knock down both cans on that level. You need to complete all levels to unlock the last level and knock down the king can.