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Compiling

  1. Clone the repo into RimWorld's Mods folder (otherwise reference paths will need fixing)
  2. Run the Multiplayer.csproj file found in the source folder with an IDE and you can just press start to compile it.
  3. Now you can just copy the About, Assemblies, Defs and Languages folders into another folder in the mods folder.

Trouble Compiling?

Ionic.Zip.Reduced might cause problems for some. The proper Nuget package is here.

Debugging

Follow these steps to set up debugging for Zetrith's multiplayer mod in RimWorld using dnSpy.

Steps

  1. Set up Doorstop
    Follow the instructions provided at the Rimworld-Doorstop GitHub repository.

    You can stop here if the breakpoints for the mod are hit in dnSpy.

  2. Open dnSpy for Debugging

    • Launch dnSpy.
    • Navigate to Debug -> Start Debugging....
    • Set the following options:
      • Debug engine: Unity
      • Executable: ..\steamapps\common\RimWorld\RimWorldWin64.exe
    • Press OK.

  3. Check if RimWorld Starts

    • RimWorld should open at this point.

  4. Find Multiplayer.dll

    • In dnSpy, go to Debug -> Windows -> Modules.
    • This will list all .dll files used by RimWorld.exe.
    • Look for Multiplayer.dll and open it, but note that it may not appear right away.

    If you find Multiplayer.dll, skip to Step 6.

  5. Search Through Unidentified Modules

    • If you can't find Multiplayer.dll, double-click any module with names like data-0000022CFEF538E0.
    • Check the left-side Assembly Explorer to see if Multiplayer.dll appears there.

  6. Set Breakpoints

    • Once you locate Multiplayer.dll, you should now be able to set breakpoints for debugging.
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MAPI Documentation

//Someone add a brief description of the MAPI and links to it here. -Swept Precompiled 0MultiplayerAPI.dll A Small Example In this section, we're going to focus on the basics of the api. Specifically, we're going to enable a mod for Multiplayer. The boilerplate By the time RimWorld reaches your mod the API is ready to use, you can call it wherever you see fit. See basic C# mod tutorials. The easiest place is [StaticConstructorOnStartup]

Jun 20, 2025
Detailed Documentation

The following is more detailed documentation. MP ISyncCall SyncMethodAttribute SyncFieldAttribute SyncWorkerAttribute SyncWorkerDelegate

Jun 20, 2025
Rimworld Multiplayer Wiki

Home Playing Installation Hosting and Joining Mod FAQ FAQ Common Desync Reasons Localization

Jun 4, 2025
Rimworld Multiplayer FAQ

Common Questions Is the mod dead? No. There will be a formal announcement if the mod ever dies. No-progress does not mean the death of the mod. The mod is developed by the community, who all have lives outside of the mod. If you want something in the mod so badly, code it yourself! We accept any constructive PRs. What happened to Zetrith? He's around doing his own thing, who knows, he might make an appearance every now and then if we're lucky. How can players connect? Players can connect through Steam, LAN, or Direct. To use direct connect, portforward 30502 through UDP or use a VPN like Hamachi.

Mar 19, 2021
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