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Unreal Tournament '04
Half Life: Counterstrike
Quake I
Quake II
Starcraft
Starcraft:Br00d War
Diablo 2
Diablo: Expansion
Command and Conquer:Tiberian Sun
Command and Conquer:Fire Storm
Roller Coaster Tycoon 2
Zoo Tycoon
Zoo Tycooninosaur Expansion
Zoo Tycoon:Marine Expansion

You?

You kidding, i don't think i have enough will to pile out all of my games.... lol
I will name som of my most used at least.....

C&C all of them except renegade
Empire Earth
Soldoer of fourtune Double Helix
Shogun and expansion
Medivel Total war and viking expans.
Battle field vietnam
All civilization games 1-3 and call to power one and two
Age of Empire I & II
Most of the Sims expansions
Zoo tycoon all the expansions

I have about 50, I don't feel like naming them all

Isn't there like 50 threads on this already?
Anyway, the games I own/use often are:
1. Diablo 2/LoD
2. Warcraft 3:RoC/TFT
3. SimCity 3000
4. Age of Empire 1,2 and exp packs