Titles that have changed/refined the way I view video games
More or less in order as they affected me.
Lots of stuff from around the 90's at first, around when I first started picking up games, and I take a step back and play games from a little before that. Then, as I get into newer games, the titles become farther and fewer apart, as my views towards games begins to take shape.
The last two are listed last, however, because they are titles that go above and beyond the rest.
Edit: Whoops, forgot to include Planescape Torment, and I stupidly made this a non-ordered list. I'll get to fixing it sometime.