This is the "Co-op Mod" working definition:
While not co-op, the STALKER: Gamma modpack transforms the Chernobyl Exclusion Zone into a living, breathing simulator. It is so immersive that many players find it satisfies the "lonely exploration" itch that Metro fans crave, removing the need for a partner to stay engaged. metro 2033 co-op mod
: Many fans scratch the itch by doing "Duo Runs," where two players play through their own single-player games simultaneously while communicating via Discord, often setting rules like "we both have to reach the next station before moving on". The Future: Official Multiplayer? This is the "Co-op Mod" working definition: While
The game’s engine is notoriously difficult to mod for multiplayer. While Steam tags sometimes erroneously list "Multiplayer" or "Co-op," these are community-added tags and do not reflect the actual features of the game. Any files online claiming to be a "Metro co-op mod" should be approached with extreme caution, as they are often malicious software Promising Projects & Alternatives The Future: Official Multiplayer
Managing filters and "military-grade" ammo between two players adds a new layer of survival stress.