Cohan CircleTwo intersecting circles. There exists a newer relative named Arusloky.
Colors CrossTwo plungers and one rotation used to move nine pieces.
ComboSimilar in concept to a number of other puzzles.
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.
DiogenesThree layers, ten segments and an unusual mechanism.
Disk PuzzleSimilar to other tricky disky puzzles with 6 colored half-cylinders in 2 layers, 6 columns.
Double CrossOne plunger and two rotations used to move ten pieces.
Double DiskA puzzle with four rotating intersecting circles.
Dual CircleDual Circle - surprisingly enough is two interlocking circles - pieces move when the circles are turned.
Dual716 tiles moved by two plungers. A custom made puzzle similar to Tri-Trick.
DuplexAn intersecting circle puzzle, but with a twist!