Rubik's 5x3 CubeThe Rubik's 5x3 Cube® is 5x3x3 six-sided puzzle that is hand-assembled and solidly constructed. From the Duane Cash Cube Collection.
Rylox PrismA bandaged and extended 4x4x4.
A mass produced version is also available.
Scramble (Super Floppy) CubeAn enhanced version of the Floppy Cube from the same inventor. A floppy cube where you can turn the faces 90 degrees.
Shape shifting 2x3x3This is a 2x3x3 that allows 90°-turns on every face and can therefore change its shape drastically. These new shapes do not lead into new scrambling or solving techniques for the puzzle.
Shapeshifting 3x3x6A fully functional 3x3x6. The pieces are deliberately designed to be unproportional.
Sliding SSQ-1The successor of Tony Fishers sliding Pucks. 6 layers of tiles taken from various Super Square-1's.
Slim CubeA 3x3x3 forced into the dimensions of a Floppy cube and thereby changing its solving properties.
Special 2x3x3Looks like a 2x2x3 but it is an enhanced hexagonal prism.
Specter CubeA fully functional 3x4x4 built by Mr. Watanabe and presented by Mr. Okamoto