That’s a hell of a lot of city building.

17 million days played, 40 million cities built, over two trillion citizens, and growing every day – it’s the fourth birthday of Cities: Skylines! With six million copies sold to date (and a million of those in the last year alone), we’ve got a ton more fun stats for you:

  • Total playtime: 16,938,045 days
  • Total population: 2,185,317,000,000 (in comparison, Earth has eight billion at most).
  • Cities built: 39,733,045
  • Unpopular mayors: 1,911,067
  • Paradox Plazas built: 7,007,128
  • Most popular building: Wind turbine
  • Mods created by the community: 175,970

“When we first launched Cities: Skylines, we knew it was special, but we never dreamed how far players would take it,” said Sandra Neudinger, Cities: Skylines Product Manager at Paradox Interactive. “The community is the heart and soul of the game – we’re just here to give them the tools they want and need to make it their own,” added Mariina Hallikainen, CEO of Colossal Order.

To celebrate, there’s special events going on all weekend, so if you ever wanted your own in game Chirper, now’s your chance! Share your best Chirper design on the Cities: Skylines social channels for a chance to see it in game; submissions close on Monday 11 March, and then Colossal Order will add the best Chirpy design into the game. There’ll also be some free radio DLC giveaways from top Cities creators, so keep your eyes open!

Cities: Skylines is available now on PC, PS4, Xbox One, and Nintendo Switch.