A few that have already been mentioned. Either Morrowind so I can experience that sense of wonder that I've rarely experienced since. Or Danganronpa, because I loved them but I see little value in replaying a murder mystery story.
pookie101 said:
life is strange.. my favourite game of all time
That was the first one that sprang to mind for me. I played the entire thing a couple of weeks ago and loved it. But it did leave me an emotional wreck and I don't think I'd want to put myself through that again.