Home

How to Solve the Hanayama Cast Quartet metal puzzle

Hands assembling a metal puzzle on a table in a classroom setting.

Learn how to solve the Hanayama Cast Quartet metal puzzle. Hanayama cast iron puzzles are the perfect solution to being bored. This video tutorial will show you exactly how to solve this mind boggling Cast Quartet puzzle, which is rated a 6 out of 6 in difficulty by Hanayama.

Hanayama: True bonds has always been hard to form, but once formed such bonds are eternal and hard to break. My original version was created with this image in mind, but the puzzle was completed into a cast puzzle with a bond that is truly difficult to unravel. How would you go about breaking and forming this bond? There are two approaches to this puzzle and I challenge you to both! The key word is "Bond."

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.