Online since 2002. The most comprehensive site for all around twisty puzzles.
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Douglas A. Engel
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.
Slide Rule DuelA puzzle with two or three circles and a plunger which can exchange pieces between the circles.
Turn Stile - basic versionA moving tiles puzzle with two intersecting circles.
Twin Spin (aka Turn Stile)Two overlapping wheels. Promotional version for The Museum Company.
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