Which game do you play the most?

I'm still religiously into 2 and I doubt that'll ever change. I have been playing 4 a lot more lately, though, after getting a dedicated gaming rig. But honestly, I'm so tempted to put 2 on there as well that it isn't even funny (despite having it on another laptop I use for 1 + 2). 2 is by far the one I've poured the most hours into, I've consistently played it since launch day with only a short gap for a couple of years when I was in high school.