Hanayama U&U

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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.