22-Game Valve Complete Pack Bundle (PC Digital Download)

Note, requires a Steam account/launcher in order to activate/play.
Counter-Strike: Condition Zero
Counter-Strike: Global Offensive
Team Fortress 2
Dota 2
Day of Defeat: Source
Team Fortress Classic
Day of Defeat
Deathmatch Classic
Half-Life: Opposing Force
Ricochet
Half-Life
Half-Life: Blue Shift
Half-Life 2
Counter-Strike: Source
Half-Life 1: Source
Half-Life 2: Episode One
Half-Life 2: Episode Two
Portal
Portal 2
Left 4 Dead
Left 4 Dead 2
The Lab