Number of levels : 20 levels in the shareware version and 122 in the registered

Description of the game :
3D Ball Slider is a peaceful game to develop skills for moving objects in space, for concentration and self control. The perfect ballistics gives an astonishing illusion of handling real objects. It offers three levels of difficulty, each with 61 runs. The game consists in letting balls roll on a plate and control them to their respective supports without falling off, controlling the inclination of the plate using the arrows of your keyboard.