RainbowminxA Pyraminx Crystal truncated on all of its thirty edges which gives it the shape of a chamfered dodecahedron.
Raptor GhostThis shape variant implements two concepts at once: "Ghost Cube" and "Twist Cubies".
Razer CubeThe concept of the Pocket Cube implemented with a 4x4x4, asymmetrically.
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.
ReactorAn Ufo meets a two layered Square-1.
Real Apple 2x2x2An apple ... not from apple, but from Tony Fisher. A fully functional, edible and temporary puzzle.
Real kite cubeA 3x3x3 truncated on two sides into a prism with a kite-shape as base.
ReciprocatorTwo sets of parallel plungers are also connected by an inner pinion. Pressing one plunger causes the adjacent plunger to move in the opposite direction.
Relativity CubeA picture-variant of the 3x3x3. The images were adapted from one of M. C. Eschers most famous works.
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.
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