A custom built 3x3x3 variation that functions as a 3x3x3.
Meffert's version from 1982 with six colours.
Back Spin / Loophole
A mix between the moving hole puzzles and the two-layer UFO puzzles.
Fake Deluxe Mechanism
A high quality knock-off, designed to look like the tiled Rubik's Deluxe.