The team at Jscrambler, an online JavaScript encryption service, have written a tutorial on creating a Sliding Puzzle game in Phaser, and then protecting it with their encryption system. It's a really interesting read if you either want to create a puzzle game like this, or learn how Jscrambler works, or both!
"Everyday we encounter puzzles in various forms. Most of the JavaScript code is ultimately a technical puzzle waiting to be solved. Developers need to find creative solutions for these puzzles, from probing for weaknesses in real-world systems to creating scalable web apps. Countless JavaScript frameworks are created with the express intent of solving a specific “puzzle”. One such framework is Phaser.js. If you’re a developer with a penchant for game development you may have heard of it."