Games I've actually played from beginning to end.

Bioshock

Black and White

Call of Duty

Call of Duty 4

Call of Duty: World at War

Command and Conquer

Commander Keen: "Marooned on Mars"

Commander Keen: "The Earth Explodes"

Company of Heroes

Crysis

Crysis: Warhead

Delta Force

Delta Force 2

Diablo

Diablo 2

Diablo 2: Lord of Destruction

Duke Nukem

Fable

Fallout

Farcry

F.E.A.R

Gears of War

Grand Theft Auto 4

Half-Life

Half-Life: Blue Shift

Half-Life: Opposing Force

Half-Life 2

Half-Life 2: Episode 1

Half-Life 2: Episode 2

Hugo's haunted house

Lost Planet: Extreme Condition

Mafia

Mass Effect

Max Payne: The Fall of Max Payne

Max Payne

Operation Flashpoint: Cold War Crisis

Portal

S.T.A.L.K.E.R. Shadows of Chernobyl

Warcraft 3

Warcraft 3: Frozen Throne

WarHammer 40,000: Dawn of War

WarHammer 40,000: Dawn of War, Winter Assault

WarHammer 40,000: Dawn of War, Dark Crusade