Hyper LooperThree circles on one line, each allowing 180° turns with very deep intersections.
IQ LollyA set of three puzzles differing only in size and the number of tiles.
itSimilar to Tsukuda's Square. Marketed in Britain.
ItaliaTwo rotating circles and one plunger make up the italian flag.
Jumble CloudA 2D-jumbling puzzle to make many others obsolete.
KaleidoscopeA moveable plunger intersecting with a rotating circle.
Kamennyi TsvetokSix intersecting circles (in steps of 120°) in a 2D-puzzle of soviet origin.