What are your "must have" games for the PC.

What games do you have for the PC, that are must haves and extremely good.

My list would be

FEAR.

FEAR extraction point

Crysis

Crysis warhead

Oblivion

Command and conquer ( any one of em)

• Company of Heroes
• TF2
• GTR 2
• Guildwars
• Supreme Commander
• MS Flight Sim X
• Audio Surf

Besides old classics like system shock 2, half life, max payne, duke nukem, blood, deus ex and starcraft

Crysis and crysis warhead

Orange box

Supreme commander

Race driver grid

Bioshock

Mass Effect

Sins of solar empires

FEAR

Stalker

-Orange Box

-Company of Heroes

-Doom II

-Half-Life

-Witcher

-Diablo II

-Left 4 Dead

That about sums it up for me.