Note: Our level rating system is different than Hanayama's. Hanayama's level 1 is equivalent to our level 5.... level 6 is equivalent to our level 10.
This puzzle is based on an original called the 'Puzzle Ring'. Popularized in 15th century Europe, this ring style was actually used for official engagement and marriage rings. Christian reformist, Martin Luther, was even known to wear one. It is rumored to prove as evidence of its wearer's adultery...when it comes apart into pieces. That's quite a history contained in this little puzzle.