Amazon.com: 4-Pack YJ Cube Set - Included 3x3 YJ Fluctuation Angle Puzzle Cube - 2x3 YJ Wheel Puzzle Cube - 3x3 YJ Mirror Puzzle Cube 6 Color - 3x3 YJ Square King
Two workers from the Unitoys Company Pan Yu in Hong Kong are assembling parts of the puzzle game "Rubik's Clock" invented by the Hungarian professor Erno Rubik in the 1980s. In addition