Hanayama cast puzzles are the world's finest brain teasers.
These high-quality, cast metal puzzles come in six challenging, Mensa-rated levels of difficulty. Inventors from around the globe compete to have their designs included in the line.
In this puzzle, two U-shaped bolts and four nuts look like a combination of spare parts, but looks are deceiving. This puzzle comes with a deviously hidden trick. Designed by Kyoo Wong from Hong Kong.
Hanayama puzzles are recommended for ages 12 and up.