Online since 2002. The most comprehensive site for all around twisty puzzles.
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Intersecting circles
Expanded Planar CopterAn larger cousin of the Planar Copter with nine instead of three circles.
Face of InfinityA circle puzzle with six hexagonally arranged axes of rotation.
Face of Infinity 7th CircleA variant of the "Face of Infinity" puzzle, where the center can turn.
Face of Infinity 7th Circle UnbandagedA partially unbandaged version of the previous Face of Infinity 7th Circle puzzle.
Face of Infinity UnbandagedAn unbandaged version of The Face of Infinity.
Farmland GearA puzzle with intersecting circles. Compared with similar circles this puzzle has additional gears inside the big square-like pieces.
Flower CrystalSeven circles intersecting in a pattern that creates just two pieces.
FluorineTwo intersecting circles. One rotates in full after 9 turns and the other one rotates in full after 3 turns.
FomalhautTwo circles with different degree of rotation in a puzzle that is still doctrinaire.
Fractal FlakesSix intersecting circles, five small ones in steps of four, one in steps of five.
Fractal TwistFour intersecting circles with growing diameter. Turns of 180° are possible at any time.
GacruxTwo intersecting circles with eightfold turns but not in steps of 45°. A jumbling-only puzzle.
GeraniumFive intersecting circles cut with 5-fold symmetry imposing unprecedented theoretical challenges.
Geranium ButterflyA version of Geranium with six circles in a line-like pattern similar to the olympic rings.
Geranium EclipseA Pocket Geranium with an additional circle.
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