Online since 2002. The most comprehensive site for all around twisty puzzles.

Six-Sided: Cube (Shape Preserving)
Multi-Star Wheel CubeA cube with hybrid axis system. The face turning parts allows for fractional angles of 45.
Multirex PlusThe Rex Cube with two additional pieces exposed.
NecronomicubeA Pentacle Cube painted customly to resemble the Necronomicon.

No Circle, No SkewbA corner turning hexahedron. Similar to the Super Ivy (QiYi) or Skewby Duo Plus, but with a different outer cut pattern.
Norsk KubAnother version of the boob cube.
O CubeA Skewb in a cage so that only the face pieces have to be solved.

O2 CubeThe slice cube implemented in something that does not look like a puzzle.
O4 CubeA Mixup Cube with all corners bandaged together and hidden in what does not look like a twistypuzzle.
Octosaurus (eight-coloured Dino)An eight colour Dino cube

Offset SkewbA Skewb with rectangular centers and four enlarged corners.
Offset Skewb 2x2x2A hybrid puzzle of Okamoto's offset skewb and a halfturns only 2x2x2.
Oh CubeA puzzle looking like a 3x3x3 but it is indeed a corner turning hexahedron.

Oskar Geary cubeA Gear cube that pretends to be a standard 3x3x3.
Oskar's Danger CubeAn extension of the Caution Cube or Geared Mixup concepts - this time with more types of moves possible.
Overlapping AI CubeA combination of the two namegiving puzzles.

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