The Domino Cube is a 2x3x3 vintage cube. It was invented in 1983 by professor Ernő Rubik himself! The name "Domino" comes from the original design of this puzzle - the top and bottom layers were colored black and white respectively, and the tiles on the 3x3 faces were numbered with dots (1 to 9) which reminds a lot of the pieces of the classic Domino game.
While the two 3x3 faces of this puzzle can turn normally like on the Rubik's Cube, the four 2x3 faces can only turn 180 degrees (half turn). Exhaustive computer simulations show us that any of the Domino Cube's combinations can be solved in 18 moves or less.
