Copolymer is an ultra simple Mark Steere game for two players. A printed paper board, a pen of one color, and a pen of another color can be used to play. Any empty, honeycomb-patterned grid with an odd number of cells can be used. Players take turns coloring in at least one cell. On her turn, a player may fill as many connected cells (adjacent to two of her opponent's cells) as she likes, and ends her turn by filling a cell that is not connected. Once the board is full, the player who has claimed the most cells wins.