Control our friend, the shiny black ball, through the treacherous Tumbler using the mouse. Collect as many of the green balls as you can to gain some points. Avoid the red-silver stars in the Tumbler. You will lose a life if you run into one. Time your movements carefully around the laser walls, and avoid running into the laser beam. You have also to be careful with the moving walls, don’t hit them. The HUD at the top of the screen shows your current time and your best time so far, as well as your score and number of lives.