Online since 2002. The most comprehensive site for all around twisty puzzles.
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Moving: Tiles
OctedronSeven pyramids in a transparent sphere moved by rotating the sphere to let the pyramids flip into the single hole.
OctoCrystalEight intersecting circles, turnable by 45° which allows additional rotations if in the correct permutation.
OctoCrystal PocketThree intersecting circles, turnable by 45° which allows additional rotations if in the correct permutation.
OlimpicA custom built puzzle with an Olympic Rings theme.
Olympic GeraniumA version of Geranium with five circles in a pattern similar to the olympic rings.
Olympic Rings (circles)Five intersecting circles with a puzzle theme based on the Olympic Rings.
OlympiumFive intersecting circles rotatable in four steps.
Orbital PuzzleThree intersecting rings in a 2D-puzzle of soviet origin.
Ordinary RingThe Binary Ring reduced to one ring.
OrionA puzzle with 25 circles and 60 pieces.
Orion (Mako)Six intersecting circles rotatable in steps of 120°
Orion-14Four intersecting circles (in steps of 90°) in a 2D-puzzle of soviet origin.
Orlov TwoTwo circles and irregular center pieces.
Orlov fourThe successor of the Orlov with four gears, even with the same middle pieces.
Orlov gearInspired by the gear puzzles from Douglas Engel. Three circles and irregular center pieces.
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