Periodically maintenance
Canon Bom is simple game that simulated the projectile motion. This app are developed by Computational Lab., Dept. of Physics, UB. And use Greenfoot to design this game before implement to android device, and just have one level to be played by user.
Just click and drag to anywhere and try to aim and boming all your enemy, beware you missed enemy passing, you score will be reduced, and also some enemy have ability to shoot you back. Let try and Have fun!