Object of play is to build a structure that touches down on your opponent's side of the barrier wall. Tiles are drawn from the tile dispenser for play. Tiles may be held, but some must be played immediately. To win, a players must build so that one of their tiles touches down on the opponent's side of the barrier wall, or force the opposing player to build so that one of his own tiles touches down in their own side of the wall. - BoardGameGeek