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How to Solve the fifteen number puzzle

A person manipulating a small electronic device with buttons.

During the video tutorial, you'll learn how to simply solve the easy and fun fifteen number puzzle. You'll learn a couple different moves to help you solve the 15 puzzle, which are called the curl and the box and twist. The curl is easy, but the box and twist is a little more complicated.

It is a sliding puzzle that consists of a grid of numbered squares with one square missing, and the labels on the squares jumbled up. The 15-puzzle is a classical problem for modeling algorithms involving heuristics.

Can you handle it?

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.

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