What is empirically the game you've played most on Steam?
I'm honestly not surprised it's X-COM Enemy Unknown for me. I was such a meticulous player in my first run and it's become a "comfort" game for me. It's one of those games I restart and play for a whole day every once in a while just to enjoy a bit of strategic brain work.
In case you don't know how to sort by playtime, go to your Profile, All Recent Games, then near the top right sort by Playtime.
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