Built a free browser coding game with Claude to help my community

A developer built Forge Code, a free browser-based coding challenge game, using Claude Code to help bridge the coding education gap in their community. The game offers two tracks: an Academy for beginners with 24 lessons and a Gauntlet for advanced players with a story campaign and unique puzzle inputs per player. It runs entirely in the browser with no login or server required.

I started this after noticing how unequal access to coding education was in my community. Some kids had every resource imaginable; others had never touched a computer. I wanted to build something free, browser-based, and unique that anyone could use to learn how to code without needing an account, a subscription, or a powerful computer. Claude Code helped me build it. I handled the design direction and content. Claude wrote most of the implementation. What is it Forge Code is a coding challenge game that runs entirely in your browser. You write a solve text function, hit run, and it checks your answer against the expected output. JavaScript runs natively in a Web Worker. Python loads via Pyodide. Nothing is sent to a server. No login required. Two tracks The site is split into two completely separate paths. The Academy is for beginners. There are 24 challenges, and every single one is preceded by a lesson. It is designed for people who have never written a line of code. The Gauntlet is for people who want a real fight. It is a story campaign across five acts, starting at medium difficulty and escalating to genuinely brutal algorithmic puzzles. Every hard challenge generates a unique input per player using a seeded RNG, so your numbers are different from everyone else's. You cannot just copy someone's answer. How the puzzle system works This was the part I was most excited to build. For harder challenges, instead of everyone getting the same input, the system seeds a random number generator with your player ID and the challenge ID. That seed deterministically generates your puzzle input and the correct answer. If you try it, I would genuinely love feedback such as which challenges felt too easy or too hard, and whether the Academy lessons actually taught you anything. Have fun coding