Rainbow MirrorborgA Bump Cube (aka Mirror Blocks) transformed like a Borg Cube. Small colored bits are added.
Rapture Dino CubeThe geometry of the 60°-moves-corner turning hexahedron implemented twice in one puzzle.
Razer CubeThe concept of the Pocket Cube implemented with a 4x4x4, asymmetrically.
RB Square-2The concept of the "Marcos Square-1" applied to a Square-2: A Square-2 in midturn transformed back into cubic shape.
Rex Ghost CubeThe concept of the Ghost cube applied to the Rex cube. This time with differently coloured stickers.
RosetteA deeper cut cousin of the Clover Cube.
Rotoskewb IIThe successor of Rotoskewb implements the true concept the original idea giver had in mind.
Santa SpinA combination of a 2x2x2 and a eight different interlocking puzzles.