Crazy TrioFour intersecting circles with a bunch of cuts.
Crossover puzzleA puzzle back from the early 1980s produced by Nintendo. It works with intersecting plunges and polarised light.
Dancing GearsA puzzle with two intersecting circles. Produced in low quantity in four different variants.
Dihexium keychainTwo intersecting circles rotatable by 120° in a minimalistic design.
DiogenesThree layers, ten segments and an unusual mechanism.
Disk PuzzleSimilar to other tricky disky puzzles with 6 coloured half-cylinders in 2 layers, 6 columns.
Double Circle PuzzleFour circles with one tile in the intersection. Every turn rotates two circles at once.
Double CrossOne plunger and two rotations used to move ten pieces.
Double DiskA puzzle with four rotating intersecting circles.
Double FiveThe Vertushka reimplemented with a more traditional mechanism.
Double LooperThree circles on one line, each allowing 180° turns with shallow intersections. Plus three additional inner circles almost of the same size as the outer circles.
Double LoticaA custom made Lotica enhanced by an additional circle.