in case some of you don't know anything about Cataclysm DDA and to entice you into trying it!
CDDA is a turn based apocalyptic survival game. notice I did not say "Post apocalyptic". imagine every end of civilization scenario you can think of, and you will more than likely see it in CDDA. you have to eat, sleep, drink, find/build shelter. you can fix up and drive any car or build your own mobile base or death machine. upgrade your character with Skyrim like character progression, (train the skills you want by reading or performing actions associated)
you can also augment your character with mutations, or cybernetics.
its completely open world, procedural cities/landscape. And it is completely free.
you may not care what I think but its an easy number two (after DF) in my top ten rougelikes.