S-Tris is 2-player game that combines tile laying like Blokus with the use of cards. Before play starts, players modify the usable part of the board by putting some blocks anywhere on the board. Each players is dealt a certain number of cards, depending on the amount of players. On his turn a player plays a card, either a square or a helper card. In case of a square card he puts the corresponding piece on the board as long as it fits somewhere. In case of a helper card he carries out the special function. Some cards, like The Bomb, allow you to remove a piece first for instance. The player who gets rid of his cards first or with the least points on his cards left after all players have passed on their turn, wins.