Subnautica Below Zero Multiplayer Mod

Created for people who want to use in LAN.
Removed unwanted software (netbird)
Added option to host custom Lobby.

How to install

Go to installed SubnauticaZero folder. Create Folders:

• Multiplayer/Game/Core
• Multiplayer/Game/Dependencies
• Multiplayer/Game/Logs
• Multiplayer/Game/Plugins
• Multiplayer/Game/Saves

Put Subnautica.Loader.dll to Multiplayer/Game
Put Data/SpawnPoints.bin to Multiplayer/Game/Core
Replace Data/Assembly-CSharp.dll in SubnauticaZero_Data/Managed
Put Dependencies to Multiplayer/Game/Dependencies\

Dependencies are everything that building Subnautica.Core results. List if you unsure:

• 0Harmony.dll
• LiteNetLib.dll
• MessagePack.Annotations.dll
• MessagePack.dll
• Microsoft.Bcl.AsyncInterfaces.dll
• Microsoft.NET.StringTools.dll
• Newtonsoft.Json.dll
• Subnautica.Core.dll
• System.Buffers.dll
• System.Collections.Immutable.dll
• System.Memory.dll
• System.Numerics.Vectors.dll
• System.Runtime.CompilerServices.Unsafe.dll
• System.Threading.Tasks.Extensions.dll

Config

• Run the game first time. Then close it!
• Go to "Multiplayer\Game\Core"
• Open Config.json
• Edit the LobbyURL to your or anyones Lobby Server ip and port. [If you running locally you can use 172.0.0.1]
• Edit the MyIp to your ip. (Make sure users can join to you, LAN mode use lan ip, otherwise use Public IP)
• Edit the HostOnPort to a desired FREE port to make the game can host on it.
• Save it.

Lobby

You need .NET 8 to build/run it. You can run it with desired IP and Port to host on it.
Added because users does not want to host the lobby on port 80.
LobbyServer IP Port
Example: LobbyServer.exe 192.168.3.50 8888

Thanks

Thanks BOT Benson for creating this.
dnSpyEx for able to read C# dlls to able to edit it.