Roundy

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This is a simple but odd little puzzle. It consists of three semicircles which are hinged together. Each pair of semicircles can be held flat forming a round face, so there are three such faces with a single colour each. Around the edge of each face is a ring four pieces which can rotate around the face. The pieces have two colours, because they have two sides which belong to different faces. There are 6 pieces altogether, in three pairs of identical pieces. Versions with 4 semicircles are slightly more common, and these often have printed designs on them or have unusual colour schemes. This puzzle was patented by Fritz Gruber on 7 December 1993, US 5,267,731. If your browser supports JavaScript, then you can play the (three faced) Roundy puzzle by clicking the link below: