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Farsala said:

Hearts of Iron IV wins this one easy for me. 556 hours played.

Also HOIV is Paradox's blockbuster. EU4 is close 2nd, Cities Skyline is next. CK is bit far behind.

I stand corrected! I constantly hear about CK3, so assumed it was the most popular, my bad.

I am not surprised to see Cities Skylines high up, but that is only published by Paradox, not developed, so I didn't consider that one. For the other two I am just genuinely surprised.