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Six-Sided: Cuboid
Proportional mirror 3x3x5 cuboidA bumped 3x3x5 with proportional pieces in the middle layers.
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.
Quartered Edges 2x3x3A 2x3x3 with edges cut into quarters. Could be viewed as a bandaged 6x6x6.
QuartetA four-sided puzzle comparable to the Grimace.

Rail-less 8 segment cheeseA rail-less one-layered Masterball in shape of a cuboid.
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.
Rubik's Tower (2x2x4 Cuboid)A mass produced 2x2x4 cuboid.

Ruby CuboidA Ghost 2x3x4. The second out of a series of three.
Rylox PrismA bandaged and extended 4x4x4.
Rylox-ish floppyA 3x3x3 bandaged and modified to look like a Rylox prism.

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