Ruby CuboidA Ghost 2x3x4. The second out of a series of three.
Rudenko ClipsA variation of the "Tower of Hanoi" with a genius simple anti-cheat mechanism.
Rudik's CubeA corner turning pentagonal antiprism or a restricted face turning dodecahedron in shape of a pentagonal antiprism.
Rugby kubeA 2x2x2 (a bumped one) in shape of a rugby ball.
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