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General Symmetrics Inc.
Barrel Shuttle 11A puzzle which looks like the wellknown moving-hole-puzzle-with-cylindrical-surface but has a mechanism which goes beyond that.
Barrel Slide 121A puzzle which looks like the wellknown moving-hole-puzzle-with-cylindrical-surface but has a mechanism which goes beyond that.
Blocked Barrel 15A puzzle which looks like the wellknown moving-hole-puzzle-with-cylindrical-surface but has a mechanism which goes beyond that.

Hexler 4Another version of the Puzzler but with visible orientation of the central hexagons.
PaletteIn this puzzle not the pieces itself move but the frame around them.
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 - 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.

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