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Six-Sided: Cube (Shape Changing)
Radio Cube 3A Radiolarian 3 (a face-turning icosahedron) redesigned to have the shape of a cube.
Rafael's Cube aka Fisher Bump CubeA bump cube was fishered or a Fisher Cube was bumped.
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.

Rotated Witeden334 cubeA Witeden Camouflage 3x3x4 in shape of a cube rotated inside the solid.
Rotoskewb IIThe successor of Rotoskewb implements the true concept the original idea giver had in mind.
Rubik's Mirror Blocks (aka Bump-Cube)Invented by Hidetoshi Takeji, Mirror Blocks is a simple 3x3 Rubik's cube, but with an interesting twist.

Santa SpinA combination of a 2x2x2 and a eight different interlocking puzzles.
Scatter Pattern Mirror BlocksA sticker variant of the MirrorBlocks which is more modern cube art.
Screw CubeA 2x2x3 in cubic shape enhanced with threads to become a way more complex puzzle

Shallow Mixup CubeA mixup cube with shallower cuts than the traditional mixup cube.
Shape Shifting 6x6x6A 6x6x6 which allows additional mixup turns.
Shift CubeA 2x2x4 with an additional shifting move.

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