As a long time MMORPG and FPS player, I've become accustomed to games where I can sink 200 hours into the game and still only experienced a small portion of what the game has to offer.
Long story short, I am going off to university soon and the internet isn't great there. I am looking for some singleplayer/offline games that can keep me entertained on rainy days and such. What I am primarily looking for is one or two games to hold my attention for a long time instead of playing through a linear story mode of 2 games a week. I guess that will mean that the games suggested will have to be open world, at least to some degree.
Any genre is accepted apart from racing games. I already have a few personal favorites already there. I don't mind playing an "old" game either.
Games NOT to suggest:
GTA
Call of Duty
Battlefield
I've played the single player portion (and probably the multiplayer portion too) of these games to death.
Single Player Longevity
