How can a 4 piece puzzle be so difficult??. All you have to do is insert them into the frame It is a Stewart Coffin design (#217) originally called Four Fit but renamed by Stewart after Martin Gardners week long efforts to solve it were in vain. Martin Gardner (1914-2010) is considered the Father of Recreational Math with perhaps the greatest puzzle mind of the 20th century. Martin called it The finest dissection puzzle of all time.

The thick pieces are precision laser cut and set unsolved into a floorboard base. The base measures 5.8 x 3.8
Note we also have available under a separate listing a larger size, a bit fancier version of the puzzle with base and cover.

Made in USA by Creative Crafthouse under license from Stewart Coffin
Note: This is our only puzzle where a solution is not provided, but can be obtained upon request at time of or after purchase.