I built a multiplayer sandbox where Claude rewrites the game rules live as you play
Confident-Honeydew66 · reddit · 2026-11-04
frenslop.io is a free browser multiplayer sandbox (Garry's Mod-like) where any player can type a request like "flip gravity every 10 seconds" and Claude writes it into the running game, synced to everyone instantly, with undo/reset on failure. Server-side: the prompt, a game-state snapshot, and docs for a small custom scripting API go to Claude; generated code hot-loads for all players without restart, and errors roll back and return to Claude for fixing. The game itself—multiplayer sync, physics loop, code sandbox—was mostly built with Claude Code; the author says he barely wrote code, iterating mainly on the scripting API and system prompt until changes stopped breaking the game.
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