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

Six-Sided: Cube (Shape Preserving)
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.

Overlapping BrilicubeA?a hybrid between Tony Fishers Overlapping Cube and Aleh Hladzilin's Brilicube.
Overlapping CubeA combination between a 4x4x4 and a 5x5x5.
Overlapping Cube VariantA simple Overlapping Cube with an additional set of four edges exposed. This puzzle turns like a cuboid not a cube.

Pancake Cube IIA 3x3x27 in shape of a cube.
Pandora CubeWorks like a 3x3x3 but with challenging new exterior.
Pandora Rainbow CubeA straightforward and beautiful shape variant of the Rainbow Cube, inspired by the Pandora Cube.

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