This game is similar to a jigsaw puzzle in that you have to take colored pieces and fit them together to make a whole. Instead of the pieces being differently shaped, however, the pieces are differently colored. Each side is colored differently, and to solve the puzzle you must put the pieces together so that each edge touches another edge of the same color. For example, if the top edge of a piece is red, the piece that goes above it must have a red bottom edge. There is no restriction on what colors are on the outside of the grid.

At the start, all the pieces are mixed up in the "workspace" to the left. The solution goes on the right grid. The puzzle is solved when all the pieces are correctly assembled in the right grid. To move a piece, simply click on it. The piece will be moved to the center. Then click on an empty square to place it. You cannot rotate the pieces. You can make as many moves as you like, and there are no restrictions about where you place them.

You can choose a 3 by 3, 4 by 4, or 5 by 5 game. The larger the puzzle, the harder it is. You can also choose to limit the color selection to two, three, or four. Sometimes fewer colors makes it easier, because there tend to be more correct ways to assemble the pieces, while sometimes more colors makes it easier, since you have more clues about how the pieces must go together.

You can save your game by bookmarking the page in the game you want to come back to later. This works for all pages of the game except for the first (which has "newgame" in the URL), so if you want to bookmark a particular puzzle from the beginning, you have to make at least one move first.