Rotascope - EscherFour customized Rotascope with themes based on famous works of M.C. Escher.
Rotascope - Escher IICustomized Rotascope with a theme based on famous works of M.C. Escher. This time with a non-circular body.
Rotating pillsOne rotating circle and one plunger rotate and move several pieces that look like pills.
Roto 36Four circles. One with 120°-steps, three with 60°-steps.
Roto 44Four circles in square configuration with a fifth in the center.
RotosEast german puzzle of overlapping disks.
Rubik's Fifteen (aka: XV)Rubik's 15 (XV) is 2 puzzles in one. Arrange the numbers in sequence 1 to 15. On the other side there is a magic square challenge.
Sando RingSimilar to a King Ring. With touchable symbols.
Slice RuleThree plungers and one circle intersect and make 15 pieces move around.
Slide 11 DiskOne plunger and one rotation (with an odd number of pieces) used to move thirteen pieces.
Slide RuleA puzzle with two or three circles and a plunger which can exchange pieces between the circles. Produced in low quantity in eight different concepts each with different color schemes.