Creative Crafthouse Calibron 12 Brain Teaser Very Difficult Wood Puzzle 12 Pieces

A very difficult puzzle meant for adults or extremely bright and patient young adults. The objective is to fit all the pieces in the large square opening.
There is only 1 solution and it is very challenging to find. We packaged the puzzle unsolved, but the solution is provided.
In the frame I made an extra space to hold one of the pieces so that it could be package unsolved. Our version is made from precision cut woods with at least 4 different woods in each puzzle. Ash, Maple, Walnut, Oak, Mahogany, Birch, Cherry, Alder, Eucalyptus, and other woods may be used with each puzzle have a little unique look. The pieces are very strong at 1/4" thick and have a nice finish.
I also laser engraved the relative size of each piece on the piece itself, which may be helpful to you folks who want to attack this analytically. It also makes identifying the pieces easier if you just want to use the instructions to solve it:)
Puzzle measures 9" x 7" in the base. The square opening is about 6.3" x 6.3" One of the many things I like about this puzzle is that it does not look nearly as difficult as it actually is. People seem to get absorbed in it quite readily as you always seem to get close. It fact though, it is a difficult level 5 (of 5) puzzle.
Originally designed in 1933 by Theodore Edison, son of the famous inventor Thomas Edison, and made by his company Calibron Products of West Orange, N.J. We are now including a cover for the puzzle so that it can be stored securely with all pieces protected.

Features of Creative Crafthouse Calibron 12 Brain Teaser Very Difficult Wood Puzzle 12 Pieces

12 Hardwood pieces with at least 4 different woods make up the set. New - now comes with cover. Comes unsolved. Your goal is to fit all the pcs into the large opening Extraordinarily difficult, yet it doesnt appear so at first Made in Hudson, Florida by Creative Crafthouse Originally designed by Theodore Edison, son of inventor Thomas, in 1933