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

Intersecting circles
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.
Crazy LoticaA reimplemented Lotica with an additional inner circle.

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.

Crazy TrioFour intersecting circles with a bunch of cuts.
Crazy puzzlerFour intersecting circles, two are 6-fold and two are 3-fold.
CrazyLoid V1Two circles with three turns. One turning in steps of 90°, the other with halfturns.


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