Cities: Skylines, the city builder and simulator that released two years ago to the day (on March 10, 2015), has now sold over 3.5 million copies worldwide. To commemorate this impressive milestone, Colossal Order are adding three new in-game buildings inspired by Chinese architecture that will be completely free to download. Called "Pearls from the East", players will be able to add a Panda Zoo, Chinese Temple, and the Shanghai Pearl Tower. There's no exact release date for the buildings yet, but expect them fairly soon.