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

Moving: Tiles
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.

Colors CrossTwo plungers and one rotation used to move nine pieces.
ComboSimilar in concept to a number of other puzzles.
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.
Crazy LoticaA reimplemented Lotica with an additional inner circle.
Crazy puzzlerFour intersecting circles, two are sixfold and two are threefold.

Crazy RodiumThe Puzzler with two concentric circles per half.
Crazy Rodium 3The Crazy Rodium with three circles instead of two.
Crazy Super LooperThree circles on one line, each allowing 180 turns with deeper intersections. Plus four additional inner circles.

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