Online since 2002. The most comprehensive site for all around twisty puzzles.
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Intersecting circles
Puzzler - ChallengerRotate each half to scramble or return colours. The variant with medium difficulty.
Puzzler - Engel's EnigmaOne of the lesser known version of Douglas' Engels Puzzlers.
Puzzler - Engel's IslandOne of the lesser known versions of Puzzler by Douglas Engel.
Puzzler - FlowersOne of the lesser known versions of Puzzler by Douglas Engel.
Puzzler - NoviceCreate a solid blue circle to solve. The simplest of three different versions.
Puzzler - PrototypeOne of the first Puzzler variants made by the inventor himself.
Puzzler - StreakerOne of the lesser known versions of Puzzler by Douglas Engel.
Puzzler - StripesOne of the lesser known versions of Puzzler by Douglas Engel.
Puzzler - TricolorOne of the lesser known versions of Puzzler by Douglas Engel.
Puzzler - TrioEquivalent to the Trio but akin the various versions of the Puzzler.
PyramiumSix intersecting circles rotatable in four steps.
Quadrastic-4A variant of the Tetrakium bandaged in a highly symmetrical fashion.
QuadrismFive circles rotating by 90°, one of them spanning almost the whole puzzle.
QuadrocollideThree circles of different sizes, all of which rotate by 90° and intersect.
Radio PlaneFive intersecting circles in a pentagonal pattern
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