ZERTZ is played with 5 white, 7 gray and 9 black marbles and 37 round tiles. The tiles are used to assemble the board; the marbles are in a pool.
Each turn you must place one marble on the board and then remove a free tile. The aim is to capture 3 white, 4 gray, 5 black marbles or 2 marbles of each color. To capture, you must jump with a marble over another marble. It sounds easy, but both players play with the same marbles and the board gets smaller with every move. Thus, the players are forced toward a situation where every move is a crucial one... when you create a trap for your opponent at the wrong moment, you may find yourself caught in the trap!