Washington Monument Wood Brain Teaser | Very Hard Math Puzzle for Adults canoga It was a system primarily

It was a system primarily used for flag signals where there was a line of sight or for encrypted morse code messages

Each board is precision laser-engraved with the standard 9x9 grid plus 3x3 cell divisions

Use it as an engaging game for your home

so no fear of losing pcs

but it's also a favorite with seniors as it develops new neural synapses in addition to being very entertaining

Washington Monument Wood Brain Teaser | Very Hard Math Puzzle for Adults canoga It was a system primarilyWe 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