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"
Lace BraceletA Torus with 7 segments and 4 slices that rotate around the torus unlike tricky disky with which it share the solving method.
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