Real 6x6x6A 6x6x6 which requires the inner 4x4x4 to be solved as well.
Rex Axis Snub CubeA Rex Cube with rotated axis systems and then truncated into a Snub cube an archimedean solid.
Rex BiconeA Rex Cube truncated and extended into the shape of a bicone.
Rex Chamfer BallA Rex Cube with custom 3D printed pieces that give it the shape of a chamfered dodecahedron.
Rex Ghost CubeThe concept of the Ghost cube applied to the Rex cube. This time with differently coloured stickers.
Rex KiteA Rex Cube with the shape of a deltoidal icositetrahedron which is a catalan solid.
Rex PuckAn axised Rex Barrel. A Rex Cube in shape of a cylinder but the axis system was twisted inside the solid.
Rhombus-Tri SliderA sliding piece puzzle similar to Elemental:Argon but with three plungers instead of four and some other small changes.
Roto 36Four circles. One with 120°-steps, three with 60°-steps.
Roto 44Four circles in square configuration with a fifth in the center.
Rotoskewb IIThe successor of Rotoskewb implements the true concept the original idea giver had in mind.
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