The U & U cast puzzle from Hanayama is a level 4 brain - teaser that looks like a collection of spare parts at first glance. With two U - shaped bolts and four nuts, this puzzle hides a devious trick. Designed by Kyoo Wong from Hong Kong, its theme is complexity. Hanayama is globally recognized for high - quality, challenging puzzles. These cast metal brain teasers have 6 difficulty levels and are Mensa - rated. Level 4 puzzles are a tough challenge for most puzzlers. Can you disassemble and then reassemble the pieces?

To use this U & U Hanayama cast puzzle, start by taking a close look at each part. The key to solving it lies in carefully observing every detail. Try to find the hidden trick to take the pieces apart. Once you've disassembled it, challenge yourself to put it back together. When handling the puzzle, be gentle to avoid any damage to the small parts. Store it in a dry place to prevent rusting. If the parts seem a bit stiff, you can use a little bit of light oil to lubricate them, but don't overdo it. Have fun with this challenging brain - teaser and test your problem - solving skills!