No, that s 14 games ;)

Gad, so many good ones. All of these will be PC, and you'll notice that most of them are newer. I got into gaming late, and Starcraft and Warcraft hold a special place solely for being my introduction to gaming. So, maybe they're not of ALL time, but they're definitely among my favorite games. There are more, perhaps that deserve to be on the list more than some of these... but I'd rather not spend all day thinking about it.
1. Starcraft and Brood War
2. Warcraft III and Frozen Throne
3. Stronghold
4. Star Wars: Knights of the Old Republic
5. The Legend of Zelda: The Wind Waker
6. Diablo II and Lord of Destruction
7. Sid Meier's Pirates
8. Sid Meier's Civilization IV and Expansions
9. World of Warcraft and Expansions
10. Plants vs. Zombies

Wont even try to rank them because I can never decide:
Elder Scrolls IV: Oblivion
Deus Ex
Star Wars: KOTOR
Star Wars Jedi Knight 2: Jedi Outcast
Dead Space
Chronicles of Riddick: Escape From Butcher Bay
Castlevania: Symphony of the Night
Chrono Trigger
Mass Effect
Ikaruga

Hmmm...ten games that left the biggest impression on me and are actually still fun for me to play...chronological order of when I played them...
Raid on Bungeling Bay (C64...one of Wil Wright's first games...nothing like The Sims)
M.U.L.E. (C64...my first multi-player [more than two people simultaneously] game)
Herzog Zwei (Genesis...my first RTS)
Mutant League Football (Genesis...Madden engine, but hilariously fun)
X-Com (PC...already mentioned several times)
Master of Magic (PC...already mentioned...and I agree...not equalled yet...)
Mechwarrior 2 (PC...already mentioned...very immersive when combined with Sidewinder)
Tekken 3 (PSOne...took a PSOne on naval deployment...we wore this out...)
Resident Evil 4 (GC...played through it multiple times)
Ratchet and Clank: Up Your Arsenal (PS2...good single-player...great multi-player...)
Honorable Mention (ie, ran out of room and I'm cheating): Archon (C64), Airborne Ranger (C64), Jumpman Jr. (C64), Questron (C64), Ultima 3 (C64), Kid Icarus (NES), Mike Tyson's Punch-Out !!(NES), Powerball (Genesis), Warsong (Genesis), Doom (PC), Master of Orion (PC), X-Wing (PC), Full Throttle (PC), Duke Nukem 3D (PC), Heroes of Might and Magic 2 (PC), Warcraft 2 (PC), Wing Commander: Prophecy (PC), Freespace 2 (PC), Baldur's Gate (PC), Fallout (PC), Diablo 2 (PC), Unreal Tournament (PC), Crash Team Racing (PSOne), Twisted Metal (PSOne), Star Wars: Rogue Leader (GC), Eternal Darkness (GC), Metroid Prime 2 (GC), Zelda: Wind Waker (GC), Mario Karts: Double Dash (GC), Ace Combat 5 (PS2), God of War (PS2), Guitar Hero series (PS2), Karaoke Revolution series (PS2), Buzz! series (PS2), Gears of War (360), Force Unleashed (360) and a few more post-1999 PC games but I've abused the thread enough.

Man, so many good ones on here! Very re-assuring to know there are folks out there who keep these games alive by playing them now and again. SO hard to choose a top ten, etc., ad nauseam... but will list nonetheless (in no particular order?):
-Icewind Dale 2
-Hexen
-Chrono Trigger
-Diablo 2
-Ultima VIII Pagan (I know, I know...I'm sorry! I don't WANT to like it anymore, I just can't help it)
-X-com: UFO Defense
-Crusader: No Remorse
-PowerStone 2 (Dreamcast)
-Blood + Plasma Pack
-Castlevania: Symphony of the Night
Honorable mentions - System Shock 2, of course; StarCraft; Project Overkill (I'm not sure wtf I like it...it amuses me); Wing Commander: Privateer; Warhammer 40,000: Chaos Gate; Mega Man X 3; EarthBound; Metal Warriors; Wrath of Denethenor; Baldur's Gate 2; Knights of the Old Republic; Star Ocean (SNES).

i can't believe all these posts and no mention of the twinsens odyssey series, maybe its because they were the first games i had played other then wolfenstein and doom.
- Twinsens odyssey
- Relentless
- Half-life 1&2
- counter-strike(online)
- elder scrolls III Morrowind
- outlaws(played it when i was a kid then could never find the full version until recently)
- Fallout 2
- Arma 2
- balder's gate 1
- Day of defeat(online)

I put on list only games i played.
# Fallout 1
# Fallout 2
# Homeworld
# Outcast
# Half Life 1
# Heroes of Might & Magic 3
# Freespace 2
# Myst
# World in Conflict
# Operation Flashpoint

1. Star Wars TIE Fighter (Collector's CD - DOS & iMUSE version from 1995)
2. The Elder Scrolls III: Morrowind (Game of the Year Edition)
3. Star Wars: Knights of the Old Republic
4. Star Wars: Jedi Knight - Dark Forces II
5. Grand Theft Auto: Vice City
6. Grand Theft Auto IV
7. Grand Theft Auto III
8. Grand Theft Auto: San Andreas
9. Half-Life 2
10. Gothic 3

my games for the metaphorical isle
Complete Ultima 7
Planescape: Torment
Deus Ex
System Shock 2
Ultima Underworld (1)
X-Wing
Final Fantasy Legend 2 (GB)
Super Metroid (SNES)
Call of Duty 4 (360)
Metroid Prime (GC)
...I could list so much more though.

1. Flashback (Amiga version)
2. Another World (Amiga version, and PC's 15th Anniversary edition)
3. Star Wars: Dark Forces
4. Final Fantasy VIII
5. Turrican II: The Final Fight (Amiga version)
6. ICO
7. Shadow of the Colossus
8. Full Throttle
9. The Dig
10. Star Wars: Knights of the Old Republic
I'm sure I've forgot some...

I only play games to pass time. A lot of time.
I only have a Top One and that is the Monkey Island Series.

Did i post in this thread already? Can't be bothered to check:
1. Ocarina of Time (n64)
2. Chrono Trigger (snes/DS)
3. Doom2 (pc)
4. Half Life (pc)
5. Jedi Knight (pc)
6. Tie Fighter (pc)
7. Desu Ex (pc)
8. Prince of Persia: Sands of time (xbox/gcn)
9. Terminator: Future Shock (pc)
10. Thief (pc)
(plus kotor1, system shock 2 and interstate76) (and goldeneye..... this is hard..)

1. Bully: Scholarship Edition
2. Metal Gear Solid
3. Grim Fandango
4. Final Fantasy VII
5. Chrono Trigger
6. Under A Killing Moon
7. Resident Evil (the acting was so bad, which is why, in part, it was so good)
8. Full Throttle
9. Command And Conquer: Red Alert 2
10. Foxhunt (not a lot of people played this I don't think, PC and PS1, all Full Motion Video)

In alpahbetic order:
-Age of Kings
-Anno 1602
-Broken Sword
-Caesar 2
-Call of Duty
-Carmageddon
-Half Life 2
-The Longest Journey
-Majesty: The Fantasy Kingdom
-Max Payne
-Medal of Honor: AA
-Monkey Island
-Planescape Torment
-Return to Castle Wolfenstein (multiplayer that is)
-Rollercoaster Tycoon
-Soldiers: heroes of WW2
-Star Wars: Knights of the Old Republic
-Starcraft
-Warcraft 3
-World of Warcraft
A top 20 since I can't be bothered to choose between these awesome games :)

LBA 2 / Twinsen Odyssey is my favorite game as you can see from my top 10 list :)
1. Little Big Adventure 2 / Twinsen Odyssey
2. Grim Fandango
3. Sanitarium
4. Dune
5. Starcraft
6. Anachronox
7. Commandos
8. Max Payne
9. Prince Of Persia
10. Monkey Island 3