DIRECT ANSWER / FIELD-READY
GRAIN ROT supports up to 4 players in online co-op plus solo play. Lobbies come in three modes — Solo, Private (friends-only) and Public — and players join through Steam's built-in invite system. There is no server browser and no friend code.
RUN CARD / 03
Carry these into the next run.
- 01Up to 4 players in online co-op, plus solo.
- 02Modes: Solo, Private (friends-only), Public.
- 03Join via Steam's built-in invite — no server browser or friend code.
- 04Use the current lobby for any later change.
FIELD NOTE / 01
The recorded player cap
The verified record fixes the co-op cap at up to 4 players in online co-op, with solo play supported. Lobbies come in three modes — Solo, Private (friends-only) and Public — and players join through Steam's built-in invite system (there is no server browser and no friend code).
FIELD NOTE / 02
Before inviting a crew
Agree on the host, privacy setting and voice plan before entering a run. In co-op, scale responsibilities (loadout, haul, anti-Rot watch, spotter) rather than just enemy expectations; button names can change between patches, so use the current in-game lobby rather than an old screenshot.
FIELD NOTE / FAQ
Frequently Asked Questions
How many players can play GRAIN ROT?
Up to 4 players in online co-op, plus solo play.
How do friends join my GRAIN ROT session?
Through Steam's built-in invite in a Private (friends-only) or Public lobby — there is no server browser or friend code.
EVIDENCE / SOURCE REGISTER