I used Claude Code to turn a 1989 DOS game I played as a kid into a relativity sim

Sorry, reposted from earlier because the video wasn't working. **Play it: [gravwars.com](https://gravwars.com)** (free, no account, phone or computer) Gravity Wars is a two-player artillery game in curved spacetime. You take turns firing missiles past planets, stars and black holes, and gravity bends every shot. It started as a remake of a public-domain 1989 DOS game (by Sohrab Ismail-Beigi) and grew into a small relativity sim: orbits precess near black holes, black holes are ray-traced with lensing, and missiles feel time dilation. Almost all of the code was written by Claude Code, with me playing, testing and deciding what to build next. ## How it's built * **Claude Code** in the desktop app, over many sessions. A roadmap folder and a CLAUDE.md in the repo hold the plan and the rules, so each new session picks up where the last one stopped. * **Plain JavaScript.** No frameworks, no npm packages, no build step. A small Python script bundles the game into one HTML file. *…