City-building extravaganza Cities: Skylines is celebrating hitting five million PC sales, and its third anniversary, this weekend by giving players free Surviving Mars content.
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According to Paradox Interactive, Cities: Skylines has sold over five million copies on PC since its launch three years ago.
To celebrate this illustrious milestone, Cities: Skylines players are getting a free Surviving Mars update which adds new content including a Rocket City building called Xchirp Launcher and an astronaut Chirper. In addition, the update includes a brand new radio station, Official Mars Radio, which only plays the best of everyone’s favourite genre - space musical electro songs.
#CitiesSkylines has sold over 5 million copies on Windows, MacOS and Linux! To celebrate the game's 3 year anniversary you'll get a @Surviving_Mars themed update tomorrow! #ChirpX pic.twitter.com/H9VOeDiTkA
— Colossal Order (@ColossalOrder) March 8, 2018
If you already own Cities: Skylines, you will also be able to save ten percent off Surviving Mars pre-orders on Steam.