Contents: 12 prisms with a red and green balls inside. A board depicting a square grid.This is an old game, played as a tic-tac-toe on 3D. The only particularity is that placing a piece you actually place as well one for the opposite player, because the pieces are double. There are some variants: 3 in a row 4 in a square 4 in a row, etc.A big box for such a small game. - BoardGameGeek