GRAIN ROT Multiplayer & Co-op Guide
GRAIN ROT multiplayer: online co-op for up to 4, friends-only lobbies, and password-protected servers added in 1.07. Real patch-note facts.
Co-op fundamentals
GRAIN ROT is built for online co-op, tagged Online Co-op on Steam. You and up to three friends descend into the ruins together and share the extraction pressure.
Lobby and privacy
Patch 1.05 fixed a friends-only lobby join bug, so inviting just your friends is reliable. Patch 1.07 added multiplayer controls and password-protected servers, giving you private sessions away from random matchmaking.
Finding a crew
The Steam Community Hub (steamcommunity.com/app/4450620) is the official discussion space for finding crews and coordinating dives. Many players post Looking-For-Group threads there.
Netcode notes
Because the Corrupted react to sound and movement, voice comms dramatically improve a squad's survival. Plan routes before you drop, and agree on an extraction threshold so nobody gets left behind greedily looting.