Online since 2002. The most comprehensive site for all around twisty puzzles.
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Oskar van Deventer
Offset HexAn offset version of Minimal Hex that makes six triangles disappear.
Offset OctaA puzzle related to Minimal Octa reimplementing Star Trap in a minimalistic way.
Oh CubeA puzzle looking like a 3x3x3 but it is indeed a corner turning hexahedron.
Opposition CubeA 3x3x3 designed from scratch. It is related to the Constrained Cube.
OrganolabacusAn extremely big variant of Astrolabacus with eighteen segments but with six channels of beads.
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.
Over-and-UnderThree rings with seventeen marbles each, unconnected but exchangeable.
Overdrive CubeA geared Masterball in shape of a cube.
Overlap Cube 2x2x23Another of Oskar van Deventers journeys into twisty-puzzle-extremism.
Pancake Cube IIA 3x3x27 in shape of a cube.
Panex DuoA doubled version of the classic Panex with five columns and an empty one.
Panex GalaxyA redesigned version of the classic Panex with three columns and an empty one.
Panex JuniorA simplified version of the original Panex with two columns.
PantaBramA puzzle succeeding the PantaCube. It is a Cubedron where not all moves are possible.
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