Proxy Cube (Earth)An MF8 Crazy 3x3x3 modified and extended on 4 sides, with 3 edges truncated.
Pseudo 2x2x3Looks like 2x2x3 but is a 2x2x2 with one crazy layer added.
Psycho CubePieces were exchanged between a Crazy 2x3x3 and its fishered cousin.
QuartetA four-sided puzzle comparable to the Grimace.
Rex 2x3x3A 2x3x3 with the top and bottom faces remodelling the Rex Cube.
Rubik's 4x3 CubeThe Rubik's 4x3 CubeŽ is the incredibly addictive cousin of the Rubik's 5x3 CubeŽ. From the Duane Cash Cube Collection. The first extended 3x3x4.
Rubik's 5x3 CubeThe Rubik's 5x3 Cubeďż˝ is 5x3x3 six-sided puzzle that is hand-assembled and solidly constructed. From the Duane Cash Cube Collection.
Rubik's EdgeAnother version of the Scramble Cube, marketed under the official Rubik's brand.
Ruby CuboidA Ghost 2x3x4. The second out of a series of three.