Is Cities: Skylines multiplayer? Yes — with Cities: Skylines Multiplayer (CSM)
Not out of the box — but the Cities: Skylines Multiplayer (CSM) mod makes it co-op. Cities: Skylines is a builder & management game released in 2015, 93% positive on Steam (275,770 reviews), with 8,842 playing right now. $29.99 on Steam.
Co-opSingle-player tooMultiplayer via mod: Cities: Skylines Multiplayer (CSM)Strategy · Builder & management
How to play Cities: Skylines with a friend: Cities: Skylines Multiplayer (CSM)
Build one city together; both players get the same tools. Cities: Skylines II is not supported. Steam lists Cities: Skylines as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.
- Players
- 2+ (one host)
- Modes
- co-op
- Status
- Maintained — works with the current game version and gets updates
- You need
- Cities: Skylines 1; Workshop or manual install; port forwarding or Steam friends
- Price
- Free
Get Cities: Skylines Multiplayer (CSM) All 77 games with multiplayer mods →
Cities: Skylines is a modern take on the classic city simulation. The game introduces new game play elements to realize the thrill and hardships of creating…
How Cities: Skylines plays with friends, according to Steam
- Online co-op
- Not listed on Steam
- Local / split-screen co-op
- Not listed on Steam
- Online PvP
- Not listed on Steam
- LAN play
- Not listed on Steam
- Single-player mode
- Yes
- Mods
- Steam Workshop
- PC Game Pass
- In the catalog (rotates monthly — see the list)
Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.
Steam tags: City Builder, Simulation, Building, Management, Strategy, Sandbox, Singleplayer, Moddable
Do you and a friend both own Cities: Skylines?
Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Cities: Skylines is one of them — then helps you pick tonight's game with a weighted roll or a bracket.
Or open the Steam store page.
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Tired of Cities: Skylines? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.
Quick answers
- Is Cities: Skylines co-op?
- Not natively. Cities: Skylines ships single-player; the community mod Cities: Skylines Multiplayer (CSM) adds co-op — Build one city together; both players get the same tools. Cities: Skylines II is not supported.
- Does Cities: Skylines have PvP?
- Only with the Cities: Skylines Multiplayer (CSM) mod, which is co-op only.
- Do we both need to own Cities: Skylines to play together?
- Yes. Cities: Skylines is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.
- How many people play Cities: Skylines?
- About 8,842 players were in-game when this page's data was last refreshed (2026-09-09).
- Is Cities: Skylines on PC Game Pass?
- Yes — Cities: Skylines was in the PC Game Pass catalog when this page's data was last refreshed (2026-09-09). Game Pass rotates titles monthly, so check the Game Pass listing before you count on it.