A client-server city-building mod has been mentioned in some contexts, but this appears to be a different project entirely—unrelated to the core Metro Exodus gameplay—and is still in the early stages.
Some dedicated modders have managed to hack the game to spawn a second character model, but these are often headless (as the game renders the player body separately from the view model) and lack animation synchronization. These mods are technical curiosities, not playable experiences. There is no functional lobby system, no quest tracking for the second player, and no way to progress through the story. The "mods" that exist are essentially broken tech demos, far removed from the seamless co-op experience fans desire. metro 2033 co-op mod
It is currently the most stable way to explore the Moscow Metro with a squad. Games That Scratch the Metro Co-Op Itch A client-server city-building mod has been mentioned in