From HD Publishing:
Magnetic Joe for iPhone is an arcade game with a revolutionarily simple control method. Your goal is to guide Joe, the little magnetic ball, to the exit of the levels by tapping the touch screen at the right moment. You would not believe what wide range of possibilities and how much fun lies in this simple action. Magnetic Joe offers you 50 challenging and fun levels, which will soon be followed by additional ones in the form of updates to the game. Completing these 50 levels does not mean game over though either, as you can always try to improve your best time.