from CE. Good Games

FPS:
Team Fortress 2
Counter Strike Source
Portal
Half Life
Half Life Opposing Force
Half Life Blue Shift
Half Life 2 (including episodes)
Day of Defeat Source
Day of Defeat 1.6
Counter Strike 1.6
GMOD 10
S.T.A.L.K.E.R: Shadows of Chernobyl
S.T.A.L.K.E.R: Clear Sky
Quake Wars Enemy Territory
Battlefield 2
Battlefield 2142
Call of Duty 2
Call of Duty 4
Unreal Tournament 2004
Bioshock
F.E.A.R.
F.E.A.R. Perseus Mandate
Deus Ex
Crysis
Far Cry
Painkiller
Quake 3 Arena
Doom 3
Quake 4
Postal 2
Return to Castle Wolfestein
Left 4 Dead
Far Cry 2
Crysis: Warhead
Call of Duty: World At War
Killing Floor
ARMA
ARMA II
Chronicles of Riddick Dark Athena
Star Wars Republic Commando
Star Wars Battlefront 1
Star Wars Battlefront 2

Strategy:
Supreme Commander
Supreme Commander Forged Alliance
Company of Heroes
Homeworld
Homeworld Cataclysm
Homeworld 2
Warhammer 4000k Dawn of War
Warhammer 4000k Dark Crusade
Warhammer 4000k Soulstorm
Evil Genius
Starcraft
Universe At War
Defcon
Darwinia
Multiwinia
Rome Total War
Medieval II Total War
Genesis Rising
Sins of a Solar Empire
Star Wars Empire at War
Sid Meier's Pirates (updated)
Civilization IV
Rise of Nations
Rise of Legends
Age of Empires III
Age of Empires 2
World in Conflict
Black and White 2
Demigod
Defense Grid: The Awakening
Plants vs Zombies
Empire Total War
Dawn of War II
Dawn of Discovery (Anno 1404)
Command and Conquer 3
Command and Conquer Red Alert 3
Battleforge
Galatic Civilization 2
Hearts of Iron II Complete
Europa Universalis III Complete

RPG:
Star Wars Knights of the Old Republic
Star Wars Knights of the Old Republic II
XCOM
Oblivion
Morrowind
Theif 3
Planescape Torment
Spell Force 2
World of Warcraft
Guild Wars
Fallout 3
The Witcher
Mount and Blade
Trine
Freedom Force
Freedom Force vs Third Reich
Icewind Dale 1
IceWind Dale 2
Baldur's Gate 1
Baldur's Gate 2
Fallout 1
Fallout 2
Mass Effect
Diablo 1
Diablo 2
Geneforge 1
Geneforge 2
Geneforge 3
Fate 1
Fate 2
System Shock 1
System Shock 2
Global Agenda
Heroes of Might and Magic III

Racing:
DIRT
GRID
Burnout Paradise
Race 07
FUEL
Need for Speed Prostreet
Need for Speed Carbon
Clutch
Toca Race Driver 3
GTR Revolution
Trackmania Nations Forever
Trials 2
Monster Truck Nitro

Other:
Street Fighter IV
Caster
X3
X3: Terran Conflict
The Sims 2
The Sims 3
Alien Shooter Vengenance
Geometry Wars
Everyday Shooter
Facade
Tank Universal
Dead Space
Devil May Cry 4
Chains
Caster
Prototype
Audiosurf

Mods:
CSS Sci Fi Mod (Half Life 2 and Counter Strike Source)
SMOD Outbreak (Half Life 2)
Zombie Panic Source (Half Life 2)
Minerva (Half Life 2)
Synergy (Half Life 2)
Insurgency (Half Life 2)
Dystopia (Half Life 2)
Neotokyo (Half Life 2)
Magna Mundi (Europa Univeralis III)
Mod34 (Hearts of Iron 2)
Kaiserreich (Hearts of Iron 2)
Cold War Extension (Hearts of Iron 2)
DAIM (Hearts of Iron 2)
Modern Day Scenario (Herats of Iron 2)