• Discord Server
• Steam Workshop
• Developer Resources
• FAQ
• Patreon

CSM is an in-development multiplayer mod for Cities: Skylines. This mod aims to provide a simple client-server experience where users can play and build together in a single game.

Instructions to download and install the latest build of the mod can be seen below. Frequently asked questions, developer information and other information can be found on the GitHub wiki for this mod.

Feel free to join the development Discord server here.

This mod and its source code is licensed under the MIT license.

The easiest way to install this mod is from the Steam Workshop. You can also download the latest development builds by following the instructions below.

1. Navigate to the latest build on Azure Devops here.
2. Click on the Artifacts button (top right) and download the zip folder.
3. Extract the folder and either run the install script, or copy all the *.dll files to %LOCALAPPDATA%\Colossal Order\Cities_Skylines\Addons\Mods\CSM.
4. Open Cities: Skylines and enable the mod.

If you want to build the mod yourself, follow the developer instructions in the wiki located here.

1. Create a new game / open an existing game. If you open an existing game, make sure both client and server load the exact same world.
2. Click the Show Multiplayer Menu button in the top-left of your screen.
3. To host a game click on Host Game.
4. To join a game click on Join Game and enter the required information.

We would like to give a special thanks to the people backing us financialy through Patreon

• Henrik Nielsen
• Daimyo
• Motey
• Ewan Colyer
• Kevin Prüßner
• C Zhang

A full list of contributors can be found here.