Double LoticaA custom made Lotica enhanced by an additional circle.
Double TriCrazyThree circles of order 3, 2 and 3, each with two concentric turns.
Double WeirdTwo samples of Weird Disk 6x6 glued by design onto each other.
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.
DubheThree intersecting circles turning in steps of 90° and 180°
DuplexAn intersecting circle puzzle, but with a twist!
Duplex 2Two intersecting circles of which one can be twisted.
ELeVeN11 tiles moved by two plungers of different size.
EightTwo intersecting circles similar to the Lotica but of different size.
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