Above:On a stand
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Dual Circle - surprisingly enough is two interlocking circles - pieces move when the circles are turned.
Two interlocking circles one red and black the other blue and black. When one circle is rotated it twists the other circle and changes the colour. The goal is to return both circles to their full colours. The idea was conceived by Bram Cohen. The puzzle was designed by Oskar van Deventer.
The year given here is an upper bound.
Diameter: 60 mm
Weight: 55 grams
Thank you to the following people for their assistance in helping collect the information on this page: Zzupler, Jack Lieberman.
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