Washington Monument Wood Brain Teaser | Very Hard Math Puzzle for Adults USNA The lid is securely sealed

The lid is securely sealed with four magnets

000 permutations

This ancient mathematical challenge blends logic

Fix two books from the same author at both ends and the third book in a fixed internal position

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Washington Monument Wood Brain Teaser | Very Hard Math Puzzle for Adults USNA The lid is securely sealedWe got the idea for this from Jerry Slocum and Jack Botermans "New Book of Puzzles". The puzzle dates from the 1930's and we tried to copy the old design nearly identically as pictured in Jerry's book. The object of the puzzle is to get all 4 sides to add to 555, the height of the Washington Monument! Each of the cubes will rotate on the internal post. A great challenge for the math inclined as it is VERY difficult. It might make a good class project