List your fav's on pc.
I'm trying to stick w/ single player based games.

Gothic 1-2 just an amazing game experience too bad 3 was um, carp

Bioshock, really good, waiting for part 2

doom 1-3 I remember parts from this that were so fun and challenging.

star wars jedi academy, just pure awesome w/ the lightsaber customization and moves. (ok so it had awesome multiplayer too)

system shock 1-2 amazing gameplay and well scripted

all of the cnc games.

Starcraft of course. (it is still on my comp)

Hey these are all old games, except for bioshock, hum I'm sure there are more but this short list sticks out I guess.

Hands down, the winner is Tunnels of Doom for the TI99/4A. I used to sit on the floor of the living room for hours playing that game with my father. Good times.

Diablo 2: I lived off that game back when it was first released. I blame it for making me almost fail high school.
Starcraft: See above.
Plants vs Zombies: Don't judge me!
Final Fantasy XI: One of the few MMO's I've stuck with for longer than a year.

I play games mostly on consoles, but there are a few odd computer games I play. Was into Alice for a bit, and I definitely liked 'the X-Files game' (anyone else remember that?) in it's time...

I remember playing Duke Nuke'Em and Wolfenstein in high school, on small floppy disks and thinking it was uber-cool. LOL

I play a lot of The Sims. Since the Sims 3 came out, though, I'm not playing as much.

I used to play SW:Galaxies, which led into POTC, which has led into STO. STO is def my favorite.

My answer will be simple.

Portal

Hands down

Star Control 2

And thats all I have to say. If your too young for that game? You should find an emulator, download the dos game and enjoy all the goodness that it represents. =)

My 2 lincolns

The whole Civilization series.
Galactic Civilizations
Port Royale
Conquest of the New World
Exploration

I think I remember that... it was in the orange box, right?

Nothing personal but *facepalm*
It's just THE best game ever invented. And the source of the "The cake is a lie The cake is a lie The cake is a lie" theory.

My favorites are:
Note: Some are PC versions.

Star Trek: Bridge Commander, Still looks good even today.

Star Trek Voyager Elite Force I & Star Trek Elite Force II, I still have those for PC and PS2.

Star Trek Armada I & II, I also have the Star Trek vs Star Wars mod for that game.

Star Trek Starfleet Command.

Star Trek Starfleet Academy.

Star Trek Away Team.

Star Trek Legacy (XBOX 360)


Now for non-Star Trek games:

Sim City 2000.

Sim City 3000.

The Sims 1.

Diablo.

StarCraft.

Quake.

Duke Nukem.

Sonic's Ultimate Genesis Collection (PS3).

Final Fantasy VII (PSOne version).