i was playing marble ultra blast on the 360 earlier today and i figured it would make a great game for the ipod touch. for the ball movement, use the accelerometer. for the jump and power jump it should have 2 small buttons at the bottom corner of the screen. like the left corner button is the jump and the right is the power jump. anyways i just think it would be the best game. you can look for some videos at youtube if you dont know what the game is already.