What do you guys think is the best pc video games ever

So many games with so many genres over so many decades of trends and technological achievements.
Gonna be tough to decide on one.

For me:
Deus Ex (2000)
Half–Life (1998)
Metal Gear Solid (2000)

Have a special place.

picking one for each genre (it's impossible to go absolute)

rollercoaster tycoon 3 (managerial)
doom 3 (horror)
trackmania united (driving)
portal (puzzle)
medieval 2 total war (strategy)
halo and fear (fps) (a draw here...for different reasons)
mafia (tps)
prince of persia warrior within (action)
the last remnant (jrpg)
mass effect (arpg)
lego star wars complete (platformer)

I expect this list to be controvertial xD

IT DOES NOT EXIST !!!

I can tell you my TOP 10 and TOP 100 but the best ever doesn't exist for me !
Off topic TETRIS is the best selling game from history with almost 500M copies!