TERMINUS

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 👇