Aliens vs. Predator
Call of Duty: Black Ops
Call of Duty: MW3
Counter-Strike
Counter Strike: CZ (And deleted scenes)
Counter Strike: Source
Cry of Fear
Dota 2
Dota 2 Test
Garry's Mod
Entire Half-Life Franchise
Hidden: Source
Left 4 Dead 2
Left 4 Dead 2 Beta
No Time to Explain
Poker Night 2
Poker Night at the Inventory
Portal
Portal 2
SEGA Genesis and Mega Drive Classics
Spiral Knights
The Stanley Parable
Team Fortress 2 (Beta)
Team Fortress Classic

And my CPU is still in good shape.