One of these keys for Doom:
Awesomenauts
GT Legends
Blood Bowl Legendary Edition
Crazy Taxi
Jet Set Radio
SEGA Bass Fishing
Sonic Adventure DX
Space Channel 5 Part 2
Bioshock 1
Bioshock 2
Borderlands GOTY
Deadlight
Duke Nukem Forever Complete
Homefront
Insanely Twisted Shadow Planet
Iron Brigade
Metro 2033
Red Faction Armageddon
Red Faction Guerrilla
Shoot Many Robots
S.T.A.L.K.E.R.: Shadow of Chernobyl
Supreme Commander 2
Toy Soldiers
Zeno Clash
Avadon the Black Fortress
Basement Collection
Binding of Isaac + Wrath of Lamb
Brazen Prototype
Cave Story Plus
Cities in Motion
Cogs
Closure
Cortex Command
Crayon Physics Deluxe
Cryostasis (not sold in store)
Deponia
Fantasy Wars
Indie Game the Movie
Insecticide Ep. 1
King's Bounty the Legend
Lead & Gold
Men of War
Men of War Red Tide
Necrovision
Necrovision Lost Company
Offspring Fling
Painkiller Black Edition
Reign: Confict of Nations
Rig n' Roll
Shank 2
Shattered Horizon
Snapshot
Space Rangers (no longer in store)
Splice
Star Wolves 3
Superbrothers Sword & Sworcery EP
Swords & Soldiers HD
Theater of War 2: Africa 1943
Titan Quest
Victoria 2
Warhammer Dawn of War 1 GOTY
Waking Mars
Zen Bound 2
XII Century Gold
