Steam p2p
Only available via Steam! The host opens the lobby after entering the base. Join via Steam overlay or Discord invites.
Coming soon · closed test build 0.1.0
COTL MP Steam brings online two-player co-op to Cult of the Lamb over Steam peer-to-peer. Host on your own save, invite a friend, and run the whole game together.
Features
Experimental build! Back up your saves before testing. Features are subject to change.
Host Based Save Data
Session runs on Host Data, streamed to the guest.
Separate Cameras
Both players get their own camera and can move around freely.
Dungeons together
Room seeds, enemies, damage, knock-outs and revives are replicated. Rewards are instanced, so weapons, curses, relics and tarot cards can be taken by both players.
Boss fights
Mostly synced, boss health bars, boss cutscene intros, rewards.
Base Building Together
Structures, progress, follower commands, indoctrination, work orders and rituals replicate.
Shared inventory
Base Building Inventory items are shared between players, from the Host.
Chat and pings
Press Enter to chat, and middle-click to ping in the world.
Mod parity checks
Mod build and installed plugins must match on both machines.
CultTweaker & COTL_API Compatible
Custom content from CultTweaker and COTL_API content ids are remapped between machines, and the host's CultTweaker content can be downloaded on join after a consent prompt.
Co-op world editing
CultTweaker's F4 room editor works online: live edits shared between players. Saving will update both host and guest map files.
Discord presence
Rich presence with Invite to Play and Ask to Join while Discord is running, showing whether you are at the base, in a dungeon or in a modded hub.
How to Play
Host
- 1Load the save. Open the pause menu and pick Host Multiplayer.
- 2Invite a friend from the Steam overlay, the friends list or Discord.
Guest
- 1Accept the invite, or join from the Steam friends list.
- 2Alternatively, join via Discord Invites.
Requirements
Mods on both machines have to match before the lobby will let you in.
- Cult of the Lamb on Steam, > 1.5.26, same game version on both machines.
- BepInEx 5.4.21 and COTL_API.
- The same mods on both sides.
- (Optional) Discord running, if you want Invite to Play and Ask to Join.