The Legend of Zelda: Majora's Mask
Nintendo 64 / Nintendo / 2000
Guessed by episteme
This is a weird one. Majora's Mask had only barely made into my initial list and it was lying near the bottom of those 50 spots - however, I always acknowledged that this game was a masterpiece and that it just wasn't my kind of masterpiece. But eventually, I tried replaying it before actually getting the real list out, and damn did I finally understand the masterpiece that it was. This is an incredible experience and is one of the finest Zelda games ever, and there's not a lot more to say about it, but that's already saying a lot about how good it is.