Counter-Strike

Team Fortress Classic

Day of Defeat

Deathmatch Classic

Half-Life: Opposing Force

Ricochet

Half-Life

Counter-Strike: Condition Zero

Half-Life: Blue Shift

Half-Life 2

Counter-Strike: Source

Half-Life: Source

Day of Defeat: Source

Half-Life 2: Deathmatch

Half-Life 2: Lost Coast

Half-Life Deathmatch: Source

Half-Life 2: Episode One

Portal

Half-Life 2: Episode Two

Team Fortress 2

Left 4 Dead

Left 4 Dead 2

Dota 2

Portal 2

Alien Swarm

Counter-Strike: Global Offensive

Red Orchestra: Ostfront 41-45

Killing Floor

SiN Episodes: Emergence

Dark Messiah of Might & Magic

Quake III Arena

Quake IV

Wolfenstein 3D

Ultimate Doom

Final DOOM

DOOM II

QUAKE

QUAKE II

QUAKE II Mission Pack: The Reckoning

QUAKE II Mission Pack: Ground Zero