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Not only do his varied puzzle box designs show his math background, but they are all made entirely of wood. There are no nails or fasteners; just intricately-fitted wood and some glue.
The Fifteen Puzzle. The classic sliding block puzzle. The 15-puzzle consists of a 4-by-4 grid with tile numbered 1 1 to 15 15 placed in the grid. The object of this puzzle is to randomly arrange the ...
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