Dual LoopsTwo intersecting rings with one or two independent rings depending on the circle in the middle.
Dual SkewbTwo skewbs built over each other to implement a rarely seen piece type instead of the non-present traditional faces pieces.
Dual716 tiles moved by two plungers. A custom made puzzle similar to Tri-Trick.
DubheThree intersecting circles turning in steps of 90° and 180°
Duke Blue DevilsAdvertising for the athletics team representing Duke university.
Dumbbell CubeTwo 3x3x3s connected with a complex mechanism. Every turned side is followed by one side of the other cube.
Dumbbell SkewbTwo Skewbs (or better: Holey Skewbs) connected with a complex mechanism. Every turn is followed by one turn of the other Skewb.
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