During the game lines will be added to the bottom of the blocks, the goal is to continually remove groups of 3 to gain points and to stop the blocks from reaching the top of the game area. If the blocks reach the top the game is over.
A group of three does not need to be in a straight line, the blocks just need to be touching each other. Touch each other only qualifies if they are to the right of, to the left of, on top of, or below the other blocks. Blocks touching on a diagonal do not count towards the group.
The game is divided into levels; during the level you must remove 60 blocks from the game board. Since you can only remove blocks in groups of three each group is worth at least three points towards this count. Each level will get faster, and for every 5 levels you complete a new color of block will be added to the mix. The more colors in play the least likely you'll find a match so you must act quickly as time goes on.