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.
Puzzler - NoviceCreate a solid blue circle to solve. The simplest of three different versions.
QuadriA very rare version of the original Swissmad. It presumably never made it into production.
Ramka A puzzle from the soviet union with intersecting plungers made in the eighties.
Rashkey 1First of a series of three similar puzzles. The three differ only by the colors of the pieces.