Build a game like Roblox with Claude Code

Build an original browser game in the same genre as Roblox: a platform of user-made multiplayer games. Use your own name, characters, art, sound and levels. Only the general mechanics should feel familiar; do not copy Roblox's name, characters, art, music or level layouts.

Version one should have:
- Simple 3D worlds players can build in
- Join other players online
- Avatars you can customise
- A few starter game modes
- Friends and chat

The hard part: Multiplayer 3D in the browser is a big build. Use Three.js plus a game server such as Colyseus, and keep the world small.

How to build it:
1. Read this folder first. If it is empty, set up a browser game with Vite, TypeScript and Phaser (or Three.js if it is 3D). Write a short PLAN.md with the game loop, entities, controls and what you are leaving out of version one.
2. Get the core loop playable before anything else: simple 3D worlds players can build in. Use simple shapes or free placeholder art until it feels good.
3. Add the rest of the mechanics one at a time, keep game rules in pure functions you can unit test, and make it work with both keyboard and touch.
4. Add a start screen, game over, score and a saved best score in localStorage, plus sound effects you generate or that are free to use.
5. Run it, play it, tune the difficulty, fix what breaks, and finish with a summary and how to deploy it as a static site.

Paste it into Claude Code in an empty folder. It plans first, so read PLAN.md and steer before it starts building.