Crash Bandicoot
Half Life (And mods)
Age of Empires II
Morrowind
NFS: Underground
The Sims
Final Fantasy series
Yeah, I've deffinitely forgotten a lot of games, and there are many more I havn't played than I have, but to me these are some of the ones I'll treasure most. Except NFS and Sims, I was just trying to spread out the genres.