Your goal is to clear all the gems from the board. You shoot at them with more gems, and when three or more of the same color come together, they all explode. Point your mouse to where you want the next gem to go and click to fire the shot. The more gems blow up at one shot, the increasingly more points you gain besides, those gems that fell apart from the rest will explode too. If your shot fails to detonate any gems, you get a foul, and when there are several fouls, a new line of gems appears at the top.