The Winning Moves Rubik"s The Void Cube is a challenging puzzle game that adds a new twist to the classic Rubik"s Cube. In this 1-player brainteaser, you must rotate the pieces of the color cube until each side is uniform in color. The new twist is that the inside is hollow with holes you can see through. This fun game helps to improve problem solving and memory skills. Ages 8 and up.