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Super Meat Boy --> 1,5 keys (1 key 3ref)
I have change if you only have 2 keys.
Killing floor 1,5 TF2keys, Magicka 1,5 TF2keys Super meat boy 1,5 TF2keys just cause 2 1,5 TF2keys
2 keys for Sanctum 2 + some of these games: F.E.A.R. 2, F.E.A.R. 3, Mafia 2, Civilization V, C&C Red Alert 3 Uprising.
The Binding of Isaac + Binding of Isaac: Wrath of the Lamb - 1 key
Serious Sam 2 - 1 key
Trapped Dead - 1 key
Painkiller Overdose - 1 key
Nation Red - 1 key
McPixel - 1 key
Forge - Starter Pack - 1 key
DLC Quest - 1 key
World of Goo - 1 key
Just Cause - 1 key
Sid Meier's Civilization V - 2 keys
Plants vs. Zombies GOTY Edition - 2 keys
Killing Floor - 2 keys
Fallout 3 - 2 keys
Resident Evil 5 - 2 keys
BioShock - 2 keys
Bioshock 2 - 2 keys
Saints Row 2 - 2 keys
Amnesia: The Dark Descent - 2 keys
The Showdown Effect - 2 keys
Guns of Icarus Online Collectors Edition - 2 keys
Super Meat Boy - 2 keys
Garry's Mod - 2 keys
Terraria - 2 keys
Titan Quest Gold - 2 keys
Magicka - 2 keys
Red Faction Guerrilla - 2 keys
Postal 2 Complete - 2 keys
Just Cause 2 - 2 keys
Renegade Ops - 2 keys
ORION: Dino Horde - 2 keys
Trine 2: Complete Story - 2 keys
Half-Life 2 - 2 keys
Rock of Ages - 2 keys
Audiosurf - 2 keys
Bastion - 2 keys
Anything of interest?
Assassins Creed 3 Season Pass ~ 4 keys
Batman Arkham Asylum Gift ~ 1key
Batman Arkham City Gift ~ 1 key + 3 ref keys
Castlevania Lords of Shadow Ultimate Edition 7 keys
Chivalry Medieval Warfare ~ 2 keys + 3 ref
Grid 2 ~ 2 keys (Game key)
Magicka ~ 5 ref
Magicka 4 pack ~ 2 keys + 4 ref
Magicka Collection (includes all 21 DLC) ~ 2 keys + 4 ref
Portal 2 ~ 3 keys
Shadow Warrior Classic Redux ~ 1 key
Skull Girls ~ 5 keys
Super Meat Boy ~ 1 key + 1 ref
Terraria single copy ~ 1 key + 2 ref
Terraria 4 pack ~ 4 keys
The Binding of Isaac ~ 1 key
The Binding of Isaac Wrath of The Lamb DLC ~ 3 ref
The Binding of Isaac + Wrath of The Lamb DLC ~ 1 key + 1 ref
Just Cause 2
or
Just Cause 1 + -Commandos 3: Destination Berlin
-Dear Esther
-Space Pirates and Zombies
-Guardians of Graxia: Elves & Dwarves DLC