Two keys appear to be permanently linked, and no matter how you look at it, there is seemingly no solution to unlocking them. However, as a highly popular puzzle since its creation during the 19th century puzzle craze, the keys are in fact separable. The hint is "Enlarge."
Hanayama's Key Puzzle is a high quality cast metal brain teaser
Discover how to separate these two interlocking pieces and then try to reassemble them!
Hanayama cast metal brain teasers have 6 levels of difficulty and each puzzle is Mensa-rated
Level 1 puzzles are considered easy by most puzzlers