Planets in different colors are appearing on the screen. Your task is to stop them expanding. By touching a planet you can make it explode. When you see a comet try to catch it - you can use it when too many planets have appeared on the screen. A comet can destroy a planet of responding color. White comet is the strongest - it destroys all the planets that are on the screen. When a planet reaches certain size it explodes itself and is counted as missed. In case of 3 missed planets the game is over.