Flip-SideTen tiles, one rotatable plane and two additional plungers.
ForamenCombines two intersecting circles with one plunger.
FormalhautTwo circles with different degree of rotation in a puzzle that is still doctrinaire.
Four by four - AnimalsAlternative versions of Tsukuda square with a several animals instead of coloured or numbered pieces.
Fractal TwistFour intersecting circles with growing diameter. Turns of 180° are possible at any time.
GacruxTwo intersecting circles with eightfold turns but not in steps of 45°. A jumbling-only puzzle.
GeraniumFive intersecting circles cut with fivefold symmetry imposing unprecedented theoretical challenges.
Geranium ButterflyA version of Geranium with six circles in a line-like pattern similar to the olympic rings.
Geranium WA bigger version of Geranium with twentyone circles in a flower-like pattern.
Gerdig UFOSpin the top/bottom half to mix the satellites, then use the central plunger to flip one, two, three or four satellites over.
Gizmo GearsA puzzle with two intersecting circles and bandaged pieces. Produced in low quantity in four different variants.