Start with two players; four is the maximum. Public rooms appear below; private rooms stay unlisted. Every room uses an eight-character code.
You can see teammates on the same level and send room messages. Supplies and weapons are shared: only one player can carry each pickup. Use the bag button or G to drop items for a teammate. Seals count for everyone; enemies and story choices remain personal. There is no friendly fire.
No public rooms are open. Create one to invite other players.