mine is fifa 98 from my brother i also have project I.G.I lord of the rings the fellowship of the ring tomb raider 1 and 2 those are pretty old
I have the original quake, the original duke nukem (not 3d, though I have that as well), original sim city and populous, and games way older than those.
i have the first dutch version of football manager Post Merge: [time]1265918519[/time] with dennis bergkamp at 20 years old age XD
I've played Commander Keen 4 off of one of those 5 1\2 inch disks I've played Keen 1 through Emulation though...
The oldest PC game I've got on my PC is probably Doom (granted, I downloaded with a client cause everyone said WinXP doesn't run it properly) Oldest game I've seen being played was Wolfenstein (spelling?)
I still have Ghostbusters on a 5.25" floppy disk somewhere in storage in my basement. I played it all the time on my dad's computer when I was a little kid. I remember souping up my car with vacuums and driving down the road sucking up ghosts. I sucked at it though, never beat it.
Myst, Doom and Roller Coaster Tycoon The only game i havent completed is Myst since its so god damn hard
The Sinclair/Commodore games are the oldest ones i know. The oldest game i have is SimTown i think. Or sim city 3K