Gungeon Together — three-player experimental build

Experimental continuation of the original GungeonTogether project by lam and contributors. The original copyright and MIT License are included.

Adds Steam co-op for three players: one host and two clients.

Installation

Install through Thunderstore/r2modman or copy GungeonTogether.dll to BepInEx/plugins. BepInExPack EtG and Mod the Gungeon API are required.

Every player must use the same version, plugins and registered ModTheGungeon items. Launch through Steam, press Ctrl+P, create a lobby, then invite the other players.

Joining and reconnecting

• New players may join while the host is in the foyer.
• The roster locks when the run starts.
• A disconnected member may reconnect to the same run.
• A player outside the locked roster cannot join midway through the run.

Included synchronization

• Three-player lobby, movement and remote avatars
• Host-authoritative enemy state and enemy projectiles
• Regular, multi-shot, charged-projectile and beam weapon replication
• Pickups, dungeon seed, rooms and floors
• Base-game and namespaced modded guns/items
• Custom enemy GUIDs and custom floor scene names
• Player health, downed state and proximity revival

Experimental limitations

This is an early experimental build. Scripted weapons that create unusual secondary objects, highly custom enemy bullet behaviours, shops, keys, blanks and some boss/floor transitions may still desynchronize. Real three-PC testing is required. Matching mod lists do not guarantee that every third-party mod is multiplayer-safe.