Kamennyi TsvetokSix intersecting circles (in steps of 120°) in a 2D-puzzle of soviet origin.
Keid 3Three circles turning in steps of 180° and one central circle to exchange pieces between them.
Keid 4Four circles turning in steps of 180° and one central circle to exchange pieces between them.
Kornephoros1Two intersecting circles of different size turning in steps of eight.
Kornephoros2Three intersecting circles turning in steps of eight, eight and two.
Kornephoros3Three intersecting circles turning in steps of eight, eight and two.
Kvadratura KrugaA puzzle from the soviet era. Its title translates to "Squaring the circle"
LemonsTwo intersecting circles with different step lengths and different sizes.
LooperThree circles on one line, each allowing 180° turns with a shallow intersections.
LoticaThe original Lotica without images on the pieces.
Mad TriadTen overlapping wheels. Each with six segments.
Magic DigitFour intersecting circles with just seven pieces visible out of twelve pieces in total, with an additional flipping mechanism for the pieces.
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