Click colored squares to play. When you click a square, all connected squares of the same color are cleared, and you score points. You score more points the more squares you clear in a single move, so use strategy to set up big groups and eliminate them all at once.
The green circles on the right show how many moves you have left until a new row appears at the bottom. As the game goes on new rows appear faster, and new colors are introduced, so stay sharp.