» Counter-Strike
» Team Fortress Classic
» Day of Defeat
» Deathmatch Classic
» Half-Life: Opposing Force
» Ricochet
» Half-Life
» Counter-Strike: Condition Zero
» Counter-Strike: Condition Zero Deleted Scenes
» Half-Life: Blue Shift

Steam, Source engine:

» Half-Life 2
» Counter-Strike: Source
» Half-Life: Source
» Day of Defeat: Source
» Half-Life 2: Lost Coast
» Half-Life: Source Deathmatch
» Half-Life 2: Episode One
» Portal
» Team Fortress 2
» Garry's Mod
» Left 4 Dead

Pre-Steam:

» Half-Life and all mods (Half-Life engine version 1.0.0.4 and later).