Your favorite PC game ever.

[MadKow]

in cronological order (as far as i can recall)

On the Spectrum ZX80:

Elite - The Original and Only Great Space trading/fighting Game
Arnheim/Desert Rats/Vulcan - great simple to get into, historical accurate, wargames
Tetris- huh... do i need a reason...?

On the PC:

Civ 1/2 - ... World Domination!!!!!
Privateer - The closest thing to Elite on the PC
Master of Magic - Civ Like strategy with nice tactical turn based combat (an ancient prelude to total war?)
Master of Orion 1/2 sames as "MOM" but in space.
Diablo 1/2 "Trinkets!!! I need Trinckets!!"

(i'm sure i'll miss quite a few, so here follows my current favorites, as in "Still on my HD and I'll buy any sequel that comes out" )

Jagged Alliance 2
Those that played Rebelstar/Laser Squad/X-Com will imediately recognize and love the gameplay with an additional great quality: Character. Each of your mercenaries has a distinct personality. And boy do they have things to say...

Operation Flaspoint
No other game llike this. None. If you havent played it you cant even begin to imagine. A very realistic battlefield simulation, endless terrain. Play it like a FPS and you're dead. A strong community keeps i very much alive since 2001 providing high quality add-ons and mods.

Shogun Total War
Medieval Total War
Need i tell you why?

I also found great relief for my brain and stress for eyes in playing Need For Speed Underground, but thats another story.