In retrospect I should have just said "Old Game Of The Year," but I spent too much time writing out that title to delete it now, dammit.
Mine's easily Dishonored 2, which rocketed into my Top 5 All Time list after collecting dust on my shelf for four years and turned me into an immersive sim snob overnight. Some of the best level design I have ever seen in any game and I'm kicking myself for not getting to it sooner. Such a shame that it seems like Arkane is losing interest in making this kind of imm-sim and no one else with AAA budgets seems to care about the genre. Ah well.
Anyway, what's your GYPFTFTI2021TDCOI2021OTY/Old Game Of The Year?