It's TWO stacking puzzles in ONE! These are no ordinary dice! Each one has been carefully designed with a unique arrangement of spots. The challenge is to form one large cube having four of a kind on each side. The odds of solving this dice game are stacked against you! Another challenge is to form one large cube having diagonals on each side that add up to seven. It's TWO stacking puzzles in ONE! Dice Stacker consists of eight natural finished wooden dice. The dice puzzle measures 2-3/8' x 2-3/8' x 2-3/8' when the dice are stacked to form one large cube. For ages 8 to 80.