What's the "One Game" that you play at least once a year?

Do you have that "One Game" that you seems to come back to every year like a clockwork? Replaying it either just for the sake of it, nostalgia, or even finishing it again?

I got a few. Skyrim is one of them but it's most likely just to have fun with installing mods and then play it only for an hour xD But I got one that I always replay and finish once a year, which is Mass Effect Trilogy, and recently the Remastered version of it.

How about you?