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Quirky Gem IA reinvented Pentajumble but with different cuts.
Quirky Gem IIA 1x2x2 that allows 60�-turns and eight additional rotations that sometimes jumble and sometimes not.
Quirky Gem IIIThis puzzle not only follows Quirky Gem II. It shares the same axis system although deeper cut and has the dual shape.

R2D2 (prototype only)A merchandising 2x2x2 of which only 4 (!) samples were produced.
R2D2 3x3x3A 3x3x3 painted with the droid from the Star Wars franchise.
R3 (Rhombic Dodecahedron Cross Cube)A Cross Cube in shape of a rhombic dodecahedron.

RACORex Axis CubeOctahedron. An axised Rex Cube truncated into a cuboctahedron.
RB Square-2The concept of the "Marcos Square-1" applied to a Square-2: A Square-2 in midturn transformed back into cubic shape.
RCP CentroidA 3x3x3 in the shape of four intersecting cylinders.

RD PentultimateA Pentultimate in shape of a rhombic dodecahedron.
RD-1A Square-1 in shape of a rhombic dodecahedron.
REAL Potato 2x2x2Another puzzle with an eat-by-date. Made because of user reactions.

RODIA shape and sticker variant of a Bump Cube modelled to implement Schrödinger's cat. It can be alive and dead.
RTL Magic JackThis version promotes RTL, a German television station.
RX (Reuleaux Master Tetrahedron)A Master Skewb transformed into the shape of a Reuleaux Tetrahedron.


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