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.