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Six-Sided: Cuboid
Overlapping 3x3x5A 3x3x4 (which is based on a 3x3x5) is modified like the Overlapping 4x4x4 was made out of a mass produced 4x4x4.
Overlapping CuboidThe concept of the Overlapping Cube applied to 2x4x4.
Overlapping FloppyA Floppy Cube modified to resemble the Overlapping Cube.

Ozonic 1x2x3A 1x2x3 "reduced to the max".
Pancake cubeA 3x3x4 was transformed by removing some pieces and exposing some others.
Phantom CubeA fully functional 3x3x4 by Katsuhiko Okamoto.

Phantom Mirror blockThe concept of the Mirror Blocks applied to a 3x3x4.
QuartetA four-sided puzzle comparable to the Grimace.
Rubik's 4x3 CubeThe Rubik's 4x3 Cube® is the incredibly addictive cousin of the Rubik's 5x3 Cube®. From the Duane Cash Cube Collection.

Rubik's 5x3 CubeThe Rubik's 5x3 Cube® is 5x3x3 six-sided puzzle that is hand-assembled and solidly constructed. From the Duane Cash Cube Collection.
Rubik's Tower (2x2x4 Cuboid)A mass produced 2x2x4 cuboid.
Rylox PrismA bandaged and extended 4x4x4.
A mass produced version is also available.

Rylox-ish floppyA 3x3x3 bandaged and modified to look like a Rylox prism.
Scramble (Super Floppy) CubeAn enhanced version of the Floppy Cube from the same inventor. A floppy cube where you can turn the faces 90 degrees.
Shape changeable 5x5x5 IA mass produced 4x5x5 modified to add another layer.

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Rubik's Void

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