The game simulates a ball free to roll in all directions on the surface of the device even beyond the limits of the device's surface. The player is needed to tilt the device in such a way so that it brings the ball at the target in the center. The rolling ball needs to have a velocity above a certain threshold (0,30m/sec) when crossing the target in order to win, indicated by a pulsing green ring. The game simulates actual ball kinematics having as inputs the attitude of the device. The player may opt to regulate the level of difficulty by a sliding selector. A spirit level bubble indicator gives feedback on the device orientation relative to the level. The speed instrument provides feedback on the radial rate of the ball approaching or departing.
