Online since 2002. The most comprehensive site for all around twisty puzzles.
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Intersecting circles
Roto 44Four circles in square configuration with a fifth in the center.
RotoidFour intersecting circles making up an enhanced version of the Rotascope.
Rotoid PlusFour intersecting circles making up an enhanced version of the Rotascope, with two pieces split up further.
RotosEast german puzzle of overlapping disks.
SadalmelikSix circles which allow turns of 180�.
SemiCollideFive circle of different sizes, all of which rotate by 90°.
ShaulaThree intersecting circles each with three steps and with different distances between the centers. All that with a doctrinaire puzzle.
Shaula 2An unbandaged version of Shaula.
SheratanTwo intersecting circles. The smaller one turning in steps of 180°, the larger turning in steps of 120°. The circles intersect extremely deeply.
Side ViewMechanically this is a simple puzzle with four intersecting circles. Innovative is the fact that one can only see the side of the pieces which is still enough to solve it.
SiriusTwo intersecting circles with 147 pieces, named after the brightest binary star system on the sky.
Sirius 3The Sirius implemented anew with a third circle.
Sirius2Sirius with one piece type less than the first version.
Soviet WhirligigA variant of the Whirligig of soviet origin.
SpicaTwo intersecting circle turning by 45°, without jumbling.
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