Cities: Skylines Multiplayer - A multiplayer mod for Cities: Skylines.
Clone or download
Latest commit 3031b50 Jan 22, 2019

CSM - Cities: Skylines Multiplayer

Discord Build Status Steam File Size

Quick Links


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.

Download & Install

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 Azure Devops site here.
  2. Click on the latest successful build (green tick).
  3. Click on the Artifacts button (top right) and dowload the zip folder.
  4. Extract the folder and either run the install script, or copy all the *.dll files to %LOCALAPPDATA%\Colossal Order\Cities_Skylines\Addons\Mods\CSM.
  5. 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