City builders and PC gaming go hand in hand all the way back to the 80s, yet players' appetite for the genre is still very much alive and kicking – as shown by current champion of the city-building games Cities: Skylines sales reaching the mammoth 12 million mark.
Cities: Skylines has been riding high among fans of city Cities: Skylines mods on offer, as well as plenty of official DLC releasing for the title.
Probably also factoring into this milestone is the fact that the game was Cities: Skylines DLC. Nevertheless, fans of city building games will be pleased to see that there's still a solid foundation of interest for the genre.
Developer Paradox Interactive celebrated the milestone with a short video thanking players for the game's success:

The game is still seeing plenty of too, with the Cities: Skylines Airports expansion, highlighted in the celebration trailer, arriving on January 25 and adding plenty of airborne and ground-based transport options for players to add to their sprawling hubs of industry.
If city builders are your jam, we saw more of train-themed sim Sweet Transit recently received a free demo as part of the Steam Next Fest event.