This idea came from tJerry Slocum and Jack Boterman's "New Book of Puzzles". The puzzle dates from the 1930's and this is a copy of the old design from the 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 from middle school to high school.

There are over 262,000 possible permutations of the disks. There are only 9 possible solutions.