Cast Puzzle Cast Enigma

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

■ Product explanation ■ Patented in the US in 1975. Inventor is Eldon Vauhn.
The letter "no" shaped Kanawa interdigitated with each other to remove it and put it back.
About 20 years ago, I got a small one in the US, but I thought it was impossible to untie it.
There is no doubt that it is at the highest level of difficulty. It comes out smoothly without any force.
Puzzle theme "Volume"
General difficulty : ★★★★★★
Product details ◆
Specifications : Window + sack box with header
Package size : approx. W75 x H119 (30) x D45mm
Materials : Zinc Alloy (ZDC)
Target age : 6 years old
* This product does not include an answer sheet.