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 Gardner's week long effort to solve it was 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". Made in the USA.
Wood cover included. The 1/4 inch thick pieces are precision laser cut and set unsolved into a floorboard base. Solution not included.
Measures 7 inches by 7 inches. We also have a smaller version without a cover.