Colossal Order’s blockbuster PC sim Cities: Skylines has hit a new milestone.

Today on stage at the inaugural PC Connects in Helsinki, the developer’s CEO
Mariina Hallikainen revealed that the title had sold 4m units since its March 2015 release.

That means it has sold more than half a million copies since March, which was when the CEO of publisher Paradox Interactive Fredrik West revealed the title had sold 3.5m units.

Hallikainen’s talk was about how the studio embraced the modding community; this was something that she credited with the success of Cities: Skylines.

The developer’s first game, Cities in Motion also performed really well due to its modding support, but its follow-up – Cities in Motion 2 – did not sell quite as strongly, in part due to its less stellar mod support.

Hallikainen’s presentation will be on the PCGamesInsider.biz website – as will all the talks and panels from this inaugural show – at some point in the near future.

PC Connects returns bigger and better in London on January 22nd and 23rd, 2018.