The Devils Square Wood Puzzle | Hard Brain Teaser for Adults clear front puzzle box 000 possible permutations with 1

000 possible permutations with 1 possible solution

Based on circle packing mathematics where the area of each piece increases by an area equal to the #1 circle

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Measures about 4

or a small keepsake inside

The Devils Square Wood Puzzle | Hard Brain Teaser for Adults clear front puzzle box 000 possible permutations with 1Another Devil of a puzzle in our popular Devil's series. (See Devils Egg and Devils Cube Also) This one has 10 fiendishly shaped pieces that will fit back into a square in the box provided. Has a solid wood cover also. If you would like to purchase laser engraving for this item, please supply text in box. Level of Difficulty: Level 5 Materials: Wood