Online since 2002. The most comprehensive site for all around twisty puzzles.

Six-Sided: Cube (Shape Preserving)
RexcageA Rex Cube with an additional type of corner but not the ones of the Master Skewb.
Rhino CubeA puzzle with hybrid axis system consisting of a 3x3x3 and half of a Compy Cube.
Ripple CubeA Rex Cube with an additional set of cuts on the same axis system.

Roadblock IA cubic 3x3x9 with some traditional corner pieces inserted. A puzzle out of a series of cubes that behave like a bandaged 9x9x9.
Roadblock IIA cubic 3x3x9 with four traditional corner pieces inserted. A puzzle out of a series of cubes that behave like a bandaged 9x9x9.
Roadblock IIIA cubic 3x3x9 with some traditional corner pieces inserted. A puzzle out of a series of cubes that behave like a bandaged 9x9x9.

RotoskewbAn offset Skewb with the mechanism of the Gear Pyraminx
Roux CubeLooks like a reimplemented Tie Cube but is a 3x3x3 with a new type of bandaging.
Royal SkewbA corner turning hexahedron with four cuts per axis. Despite the other puzzles with these properties the cuts are placed closer to the core.

Rubik's CbueA very tiny 1x1x3 which pretends to be a Mini cube. Please note the spelling error on the packaging.
Seven cubeThe Compy Skewb plus trivial tips.
Sevens 6x6x7A 6x6x6 with some internal pieces undisclosed to create a cuboid.

Shell CubeA hybrid puzzle that combines the corners turns of a coin cube and the edge turns of the clover cube.
Shepherd's SkewbA sticker variation of a skewb.
Simple Overlapping CubeA 3x3x3 without edges.


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