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

Intersecting circles
CalendulaThree circles intersecting each other like the Arusloky.
Calendula VFour circles intersecting each other like the Arusloky.
CapellaA hard jumbling intersecting circle puzzle.

CapriciousSix circles that intersect at two different depths.
CastorOne circle on the inside and five circles on the outside form a complex puzzle, derived from a theory-ladden concept.
Circle PuzzleFour intersecting circles with fourfold symmetry.

Circle Puzzle - MastercardTwo intersecting circles with a fourfold symmetry.
Cohan CircleTwo intersecting circles. There exists a newer relative named Arusloky.
CollideThree circles with 90-turns but in different sizes.

ColondraEight intersecting circles bandaged comparable to the Rotascope.
Cor CaroliThree intersecting circles rotating around two centres.
Corner of InfinityA three circle puzzle centered on the corner of a hexagonally tiled infinite plane.

Corner of Infinity UnbandagedAn unbandaged version of the Corner of Infinity.
Crazy LekkiTwo intersecting circles with four rings and three different possible turns.
Crazy LooperThree circles on one line, each allowing 180 turns with a shallow intersections. Plus three additional inner circles.

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