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Turn Stile - basic version
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A moving tiles puzzle with two intersecting circles.

The original Binary Arts puzzle. It consists of two overlapping circular disks. Each disk has 12 pieces, 6 are triangular, 6 rectangular alternating along the rim of the disk around a hexagonal centre. The disks have three pieces in common. Each disk can be rotated. A rotation has to be a multiple of 60 since only then can the other disk move again. The box is marked 1996.



Thank you to the following people for their assistance in helping collect the information on this page: Lawrence Cuthbert.


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