Rubik's CubeRu‧bik's Cube /ˈruːbɪks ˌkjuːb/ (also Rubik Cube) trademarka type of toy consisting of a cube with nine smaller coloured cubes on each side. The small cubes must be turned so that each side of the toy shows one colour only. Rubik's Cube was a very popular toy in the 1970s.