The game is played similar to Mah Jongg. The goal is to remove pairs of matching tiles until there are no tiles left. Tiles can only be removed if they are free. This means there is a blank space on the left or right side of the tile. Or, if the tile is on the left or right edge. There are an even number of each tile so every game should be winnable given the correct strategy. If you get rid of all the tiles, click the end game button and you can submit your time to the high scores list.