Want to play a single-player game with your friends? Point your AI coding agent at this
repo. It researches what exists, reverse engineers the game and its engine if it has to,
builds or fixes the co-op, tests it with bots inside the game, and packages it so your
friends install it in one click and join over Steam without port forwarding.
The sky is the limit. Every game that runs on your PC is a candidate.
Playing on one PC? Couchlink runs a copy of the game for each player,
each with their own part of the screen, their own controller or keyboard and mouse, and their own Steam account if
they want one. It works with co-op mods and with games that only play online. Mods made here can plug into it: see the
couchlink skill.
Games being made co-op right now: Deus Ex (released) ·
Fallout: New Vegas · Zelda: Ocarina of Time (fully synced) ·
Dungeon Keeper · S.T.A.L.K.E.R. Shadow of Chernobyl
From the community: Mega Man X and
Mega Man X4 (native PC with co-op netplay) ·
Pilotwings 64 (split-screen) ·
Crab Champions · Stacklands ·
Half Sword · Enter the Gungeon ·
Clive Barker's Jericho · Poppy Playtime ·
Divinity II (split-screen) · Command & Conquer 3 (campaign co-op) ·
Far Cry 2 · Gothic 3 · Fear & Hunger ·
Modern Warfare 2 (campaign co-op) · Little Nightmares (on our Discord) · yours next?
Quick start
Tell your agent (Claude Code, Codex, Gemini CLI, Cursor, OpenCode, ...):
Read https://github.com/cranebeaker/coop-anything and follow AGENTS.md.
I want to play <game> in co-op with my friends.
The agent follows AGENTS.md and the skills in .agents/skills
(also in .claude/skills for Claude Code).
Add the MCP server
The Co-op Anything MCP lets any agent search the co-op directory, detect a game's engine
from its install folder, read the playbook and skills, and validate contributions.
Claude Code picks it up from this repo's .mcp.json; for other agents:
claude mcp add coop-anything -- python <clone>/tools/mcp/coop_mcp.py
Codex, Gemini CLI and Cursor setup: playbook/mcp.md. For the binary work,
pair it with a reverse-engineering MCP such as REA
(npx rea-agents setup): Co-op Anything knows what to do, REA looks inside the game.
How it works
Your agent takes one of two paths.
| Path 1: finish what exists | Path 2: build it from zero |
|---|
| When | A co-op mod exists but is buggy, stalled or abandoned. Most loved games are here. | Nothing usable exists. |
| How | Find the last build, mine its bug reports (issues, forums, Discord), audit the code, fix it as a separate package, test, ship. | Reverse engineer the game and engine, hook in, show the second player, sync enemies, world and story, handle level changes and saves, test, ship. |
| Skills | coop-research, coop-revive, coop-qa, couchlink | coop-reverse-engineer, coop-build-from-zero, coop-networking, coop-sync-testing, coop-qa, couchlink |
| Guide | Reviving abandoned mods | How co-op mods work |
Both paths end the same way: automated tests with real game clients
(QA), easy install, Steam relay networking
(networking), and a pull request back here.
Sync test tools
Ready-made, game-agnostic tools for building and testing co-op sync, in tools/.
Each has tests, mutation twins and one command that prints ALL OK
(python -I tools/test_all.py runs them all).
This is the beginning of the README. Read the rest at the original. Read the full README ↗
