"SisyFox" is a multidimensional game. With a 4 ft. large stability ball as input medium it stimulates arm, shoulder girdle and torso muscles as well as trains motion sequen- ces and is on top a lot of fun! The ball-bearing, huge ball connects the real world with the digital world in the most intuitive way. Rotating the ball controls the digital character which is forced to roll an immense boulder up a hill, according to the Greek mythology "Sisyphus"