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

Moving: Tiles
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.
QuadriA very rare version of the original Swissmad. It presumably never made it into production.
QuadrismFive circles rotating by 90°, one of them spanning almost the whole puzzle.

Quadro 3An redesigned and improved version of Slide Rule Duel.
QuadrocollideThree circles of different sizes, all of which rotate by 90° and intersect.
Quadruple DiskTwo Double Disks fused into one puzzle.


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