Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

Douglas A. Engel
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.
Battle GearsA puzzle with intersecting circles and bandaged pieces. Produced in low quantity in seven different variants.

Blocked Barrel 15A puzzle which looks like the wellknown moving-hole-puzzle-with-cylindrical-surface but has a mechanism which goes beyond that.
Dancing GearsA puzzle with two intersecting circles. Produced in low quantity in four different variants.
Farmland GearA puzzle with intersecting circles. Compared with similar circles this puzzle has additional gears inside the big square-like pieces. Privately produced in small quantity in four variants.

Gizmo GearsA puzzle with two intersecting circles and bandaged pieces. Produced in low quantity in four different variants.
Kangoeroe PuzzlerA newly colored version of the classic Puzzler.
Magical GearsA puzzle with two intersecting circles. Produced in low quantity in four different variants.

PaletteIn this puzzle not the pieces itself move but the frame around them.
Petal Puzzle (aka Triplex 3)A puzzle with intersecting circles and a threefold symmetry.
Puzzle Avenger (Asian Version)This Puzzler was made in Taiwan (not for sale in the U.S.A.)

Puzzle Avenger (Promo Version)This is probably a promo version
Puzzler - AvengerRotate each half to scramble or return colors. The most difficult of the three versions
Puzzler - ChallengerRotate each half to scramble or return colors. The variant with medium difficulty.


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