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Feature

Hanayama's Keyhole 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 4 puzzles are considered challenging by most puzzlers

Description

Hanayama cast puzzles are the world's finest brain teasers. The Keyhole is a high-quality, cast metal puzzle that is Mensa-level rated difficulty. The theme is "groove" which was devised by Finnish Vesa Timonen.