R2D2 3x3x3A 3x3x3 painted with the droid from the Star Wars franchise.
RCP CentroidA 3x3x3 in the shape of four intersecting cylinders.
RODIA shape and sticker variant of a Bump Cube modelled to implement Schrödinger's cat. It can be alive and dead.
Radiation CubeA 3x3x3 in shape of hexagonal prism, stickered to resemble the warning symbol for radiation.
Railway CubeAn easier variant of the maze cube with a railway theme.
Rainbow MirrorborgA Bump Cube (aka Mirror Blocks) transformed like a Borg Cube. Small coloured bits are added.
Raptor GhostThis shape variant implements two concepts at once: "Ghost Cube" and "Twist Cubies".
Ray Ban CubeI'm calling it this only because Ray Ban is the most recognizable brand on the six faces!
Real kite cubeA 3x3x3 truncated on two sides into a prism with a kite-shape as base.
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