Mod «Multiplayer» for Rimworld (v1.4 - 1.5)

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14.09.2025 19:57

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Yukan

Description Change List Previous versions

Last update: 14.09.25.
Reason: Update mod to version: 21.07.25

This mod allows you to play full games of Rimworld cooperatively with your friends.

Rimworld Multiplayer is an open-source, community driven mod to implement multiplayer into RimWorld.

Play with as many players as you want to! (We recommend a max of 8 though)
Integrated with the Steam API, so no portforwarding is needed.
Can auto sync config files, download enabled workshop mods between the host and players. (Only via steam)
Compatable with Royalty, Ideology and 98% of all vanilla features except for colony naming, certain quests, and a few dev tools.
Supports multi-colony setups. You can enable async time which makes each colony run their time separately.
You can connect through either LAN, Steam, or direct connect (Latter requires you to portforward or use a vpn)
Mod support. (Not all mods will work in multiplayer. Please read the "Using mods in multiplayer" if you plan on using them)
Mod support status is shown directly in the ingame mod menu.
API so you can easily add support for the multiplayer mod.

Mod Download Order.

Multiplayer comes after Core, but before various technical mods like Hugslib.

How can I use a direct connection?

Type 0.0.0.0 in the "direct" field if you don't understand how it works, and people use your public ip or the ip assigned to you by the program you use to connect.
You can find your public ip address by doing a google search, etc.
If this does not work, the connection may be blocked by the firewall.

What ports should be forwarded in case I want to use a direct connection?

30502 over UDP.

How do I convert my multi-user save to a single-user save?

Click on the save that you want to convert and click the "Watch" button. When the download is finished there will be a "Convert to Single-player" button in the ESC menu.

Using mods in multiplayer:

When using mods in multiplayer, there are a few things you will need to do.

First of all, make sure that any mods you try to use in multiplayer are marked as compatible with the multiplayer mod, or it is very likely that you will encounter a lot of desynchronization, which in some cases can cause the game to break.

You should also arrange your mods in the same way and have the same downloaded mods all the time when trying to play multiplayer with them.

Once this is done, the host will need to share their config files to make sure that all of your configs are exactly the same, or you will probably have some desync problems associated with that.

Configuration folder location on Windows, Mac and Linux:

Windows: "C:\Users\%USERPROFILE%\AppData\LocalLow\Ludeon Studios\RimWorld by Ludeon Studios\Config"
Mac: "~/Library/Application/Support/RimWorld/Config/"
Linux: "~/.config/unity3d/Ludeon Studios/RimWorld by Ludeon Studios/Config"

Important: Requires the Harmony mod installed.

- Extended support for fragmented packets and handling them. Improved download dialog (#584)
- Fix: Starting items not marked as forbidden (#575)
- Prevent duplicate monolith generation in multifaction (#563)
- Fix scenario research lost on reconnect (#588)
- Clean up #535 fixed by #575 (#592)
- Bump Languages
- Version 0.10.7 1.5.4409 assemblies

* Support for 1.6 is in progress and not included here yet.

18.07.24 (v1.4 - 1.5)

- More resilient syncing of bill repeat mode (#522)
- Fix ping always showing 0ms when connecting without using LiteNetLib (#529)
- Encapsulate MpConnectionState.packetHandlers via GetPacketHandler (#531)
- Integrate IsFragmented into PacketHandler (#532)
- `SyncField` buffering: expanded docs, simplified code flow, and improved UX (#533)
- Introduce Byte{Reader,Writer}.{Read,Write}Enum (#530)
- Disable Trade/Transport/Caravan Session Buttons for Other Factions (#507)
- Fix errors caused by pocket maps with Multifaction/spectator faction (#475)
- Fix/sync CompObelisk_Abductor (Warped Obelisk/Labyrinth) (#476)
- Psychic ritual syncing (#482)
- Include map count in desync info (#483)
- Rework FixNullMotes patch (#489)
- Fix starting bestowing ceremony using right-click (#490)
- Fix Toxifier Generator dev mode infinite loop (#491)
- Exclude Spectator faction from FactionRepeater (#492)
- Create PauseLockSession during PostLoadInit in ExposeData (#493)
- Make AOE game condition causer use correct map time, fixes #210 (#494)
- Sync atmospheric heater "reset" gizmo (#495)
- Fix only one faction having to Anomaly research in Multifaction (#496)
- Synced all research tab buttons, fixes #290 (#497)
- Updated the list of ignored mod configs (#498)
- Fix void monolith float menu causing desync with `CompProximityLetter` (#499)
- Register sync methods directly rather than using API (#500)
- Rework some PawnColumnWorker syncing (#502)
- Use more `nameof` and use Harmony to access properties rather than methods (#503)
- Update WorldObject sync worker delegate to handle pocket maps (#504)
- Make RNG in multiplayer more random, fix small RNG bug (#523)
- Sync "Reset cooldown" dev-mode gizmo for Abilities (#524)
- Fix #521 (#527)
- Improved starting experience for multifaction (#508)
- Add SyncWorker for ThingDefCount serialization (#540)
- .NET Framework 4.8 & .NET 8 upgrades (#551)
- Add SyncWorker for Room serialization (#565)
- Fix for #547 (#550)
- Handle every Enum type (#545)

* Support for 1.6 is in progress and not included here yet.