In this game you need to track mulitple moving objects. At the start of each level some balls will be shown and a few will be highlighted, you need to remember which balls are highlighted. After a while the highlight disappears and the balls start to move, after a while the balls will stop moving and you need to pick up the balls that were highlighted. If you succeed, then you can go to the next level, otherwise you lose and the game is over. There will be more balls in new levels and the game will be harder and harder.