Once again, Cannon Challenge is another free application.

The game on the whole is simple, you’re a tank and you have to shoot at targets. By varying angle and velocity you can vary the distance and gradient of the projectile.

Overall, the game is relatively simple, but curiously fun. There are only so many positions of targets on the screen, but the application seems to be able to mix them up enough to keep you entertained. Definitely good at passing the time.