Reach-Out CubeMechanically a cousin of Rhombiminx and Lolo's Octahedron this puzzle has a more intuitive shape and looks more like the Cross Cube.
Red Bump BallA 3x3x3 in shape of a sphere. In addition the core was moved away from the shapes center.
Relativity Cube (2x2x2)A picture-variant of the 2x2x2. The images were adapted from one of M. C. Eschers most famous works. The same was already adapted to a 3x3x3.
Rex 3x3x3A hybrid puzzle combining the 3x3x3 with a rex cube.
Ribbon CubeA 4x4x4 bandaged into a 2x2x4 and with half its pieces removed.
Rosa DavuricaA Helicopter with triangles glued onto the triangular pieces.
RotaMinxThis is a "fishered" megaminx although this description doesn't do justice to the craftmansship behind it.
Roto CrystalRotoCrystal is an 18 sided analog of the Fracture-10 puzzle, based on the hexagonal dipyramid.
RotoPrism 2A modified shape with a lower-order slice pattern for the Fracture-6.
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