Favorite game of all time. GO!

Warcraft 3 + Expansion.

World of Warcraft.

time splitters <3 on the gba :D

Legend of Dragoon

devil may cry

Portal 2 or Bioshock

Final Fantasy VII, although I sank much more time into Starcraft.

arcanum, of steamworks and magick obscura

Age of Empires 2

Planescape: Torment

Legend of Zelda: Ocarina of Time

still my fav game of all time

Half Life 2

Metal Gear Solid

can't decide between mgs and monster hunter

GTA: Vice city - still can't get its songs out of my head...

Gothic 2 including the addon night of the raven. One of the best RPG's ever. Really good story and its EXTREMELY fun messing around with the tons of mods (Most of them german and cheats. :D

Chromehounds.

Gothic

Quake 3 Arena!

Quake 4 Multiplayer - Vers. 1.42 + Q4Maximiser Mod

GTA SA maybe... Too many favorites..

I really love Trauma team too, has someone has mentioned above. Really great game

half-life (+ mods), daa...

Red Alert 2, Risen, Age of Mithology these are some older games, newer Dishonored, Fallout 3 and New Vegas, Darksiders I and II.
Edit: lawl I thought it's games not game, well I'll go with fo3 then.