PyracueA Skewb variation built by Hiroshi Ishino and presented by Katsuhiko Okamoto.
Quirky CubeA puzzle which reminds one of the Square-1 but introduces a whole set of changes to the original set.
Radio Cube 3A Radiolarian 3 (a face-turning icosahedron) redesigned to have the shape of a cube.
Rainbow MirrorborgA Bump Cube (aka Mirror Blocks) transformed like a Borg Cube. Small colored bits are added.
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.
Screw CubeA 2x2x3 in cubic shape enhanced with threads to become a way more complex puzzle