A speed-stacking game with 3D pentominoes (polycubes). Depending on the chosen mode of play, players race to build the structure shown on a single large card or to finish stacking each piece shown on their set of 8 small cards which they flip one-by-one (sets can either have 1 of each shape in the game or all 32 cards can be shuffled and distributed randomly). As with many of the publisher's games, several variant play modes are also included.