Each player chooses a colour and takes a set of 21 pieces. The first player places a piece of their choice on one of the two starting points. The second player then places a piece of their choice on the second starting point.
Each new piece must touch at least one other piece of the same colour, on the corners only! Pieces of the same colour cannot be in contact along an edge. However, pieces which are not of the same colour can touch along the sides.
When the two players are blocked, each one counts the number of squares they were able to place on the board. The winner is the player who has the most number of squares on the board.