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A variant of the famous "15" puzzle which allows endless beautiful patterns.
The idea of this puzzle was described in Russian magazine "Наука и жизнь" (Science and life) N 5, 1976. Compared with a traditional "15" puzzle it contains 16 items, and the bottom slider can be moved. Endless beautiful pattern can be made with this puzzle.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Blake Nors.
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