Quarto! has a 4×4 board and 16 pieces. Each piece has four dichotomous attributes :– color, height, shape, and consistency. Each piece is either dark or light, tall or short, square or round, and hollow or solid. The object is to place the four pieces in a row in which all four pieces have at least one attribute in common. The interesting twist is that your opponent gets to choose the piece you place on the board each turn.