One player starts with a yellow tile, the other with a red tile. Twenty-one other tiles have some combination of red, blue and yellow on them, with each corner being a solid color. One tile is placed randomly on the table as a starting tile, and the other tiles are randomly distributed between the two players.
On a turn, a player adds one tile to the layout. The tile must be adjacent to at least one tile already on the board, and the colors of the just-placed tile must match all adjacent tiles, even if they touch only at a corner. The player scores points by adding to colored areas already on the board; he scores one point for each tile in a colored area that he adds to, while scoring no points for the tile just placed. (The starting player begins with five points.)
A player must add a tile to the layout on his turn, discarding a tile instead if one can´t be placed. After all tiles have been placed or discarded, the player with the most points wins.