Dimensions is a three-dimensional tic-tac-toe variant, but a somewhat unusual one. The play area consists of four 4x4 stacked boards. On a turn a player generally places a chip on an empty square, but instead a player can choose to rotate one of the top three boards by a quarter-turn. Players score points any time three or four of their pieces form a line, with more points for rows of four and for rows which cross levels. - BoardGameGeek