Cast Donuts from Hanayama - Review | Two loops joined together seems like an impossible puzzle to take apart but there is a trick to it. You might need some coffee as
Hanayama Cast Donuts Puzzle – Level 4 of 6 – Fairly Hard – Includes Crux Sticker – TopToy
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Hanayama Cast Donuts - Mind Games USA
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Gabriel Fernandes' Puzzle Collection: Cast Donuts (連)
Gabriel Fernandes' Puzzle Collection: Cast Donuts (連)
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Cast Donuts from Hanayama - Solution - YouTube
Cast Donuts - Hanayama Metal Puzzle - Solve It! Think Out of the Box