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

Six-Sided: Cube (Shape Changing)
Rapture Dino CubeThe geometry of the 60-moves-corner turning hexahedron implemented twice in one puzzle.
RaskewbThe Mental Box after a 180 turn reshaped into a cube.
Razer CubeThe concept of the Pocket Cube implemented with a 4x4x4, asymmetrically.

RB Square-2The concept of the "Marcos Square-1" applied to a Square-2: A Square-2 in midturn transformed back into cubic shape.
Redi bumpA bumped version of the Redi Cube.
Rex Ghost CubeThe concept of the Ghost cube applied to the Rex cube. This time with differently coloured stickers.

Rhomdo CopterThe Rhomdo Comet in shape of a cube.
Riddle SkewbThe Offset Skewb which allows 60 turns.
RosetteA deeper cut cousin of the Clover Cube.

Rotated Witeden334 cubeA Witeden Camouflage 3x3x4 in shape of a cube rotated inside the solid.
Rotoskewb IIThe successor of Rotoskewb implements the true concept the original idea giver had in mind.
Santa SpinA combination of a 2x2x2 and an eight different interlocking puzzles.

Scatter Pattern Mirror BlocksA sticker variant of the MirrorBlocks which is more modern cube art.
Screw CubeA 2x2x3 in cubic shape enhanced with threads to become a way more complex puzzle
Screw Square OneA Square-1 combined with the mechanism of the Screw Cube.

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