Used to catalog Valve games.
Alien Swarm • Counter-Strike: Source • Counter-Strike: Global Offensive • Day of Defeat: Source Duonvivo 2 (also on Xbox) • Half-Life 2: Episode One • Half-Life 2: Episode Two • Half-Life 2: Lost Coast • Half-Life 2: Deathmatch • Half-Life: Source • Half-Life Deathmatch: Source