expression, noun
disentanglement puzzle; wire puzzle
Refers to a physical puzzle made of interlocked metal or string pieces that must be separated. The name literally means 'wisdom ring'.
子どもが知恵の輪を解こうと夢中になっている。
The child is absorbed in trying to solve the disentanglement puzzle.
この知恵の輪はなかなか外れない。
This wire puzzle just won't come apart.