Co-op Anything allows you to instruct your AI coding agent to transform a single-player game into a multiplayer experience, and then test the results directly within the actual game.
Simply provide a game to your agent; it will research existing mods, reverse-engineer the engine if necessary, develop co-op support, and produce a version that your friends can install and play.
→ Revive abandoned mods: Discover broken or incomplete co-op projects and resume their development.
→ Build multiplayer from scratch: Reverse-engineer game logic and synchronize players, enemies, worlds, quests, and story progression.
→ Test with the actual game client: Utilize bots, automated scenarios, and in-game state comparisons to catch synchronization bugs.
→ Detect desyncs: Use "flight-recorder" tools to pinpoint exactly where two game instances begin to diverge; every failure then becomes a regression test.
→ Handle network issues: Simulate challenges like lag, packet loss, packet reordering, and connection drops to verify the mod's robustness.
→ Share with friends: The workflow includes packaging and Steam Relay Networking, enabling friends to connect without the need for port forwarding.
It already tracks over 230 co-op mods and projects, including those for *Fallout: New Vegas*, Deus Ex, Dungeon Keeper, and Zelda: Ocarina of Time.
It is compatible with AI coding agents such as Claude Code, Codex, and Cursor.
Repo 👇
if you're a lesbian attracted to a fictional male character that doesn't count because they're fictional, but being attracted to a fictional 12 year old somehow makes you a pedophile
New contender for the greatest GTA mod of all time
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You can pick any song you like, just provide it with an mp3