Red Faction Guerrilla or Metro 2033 + Greed Corp or Splinter Cell Conviction DLC for Borderlands
Just Cause 1, Supreme Commander 2, Hitman Blood Money, or Quantum Conundrum for Borderlands?
Air Conflicts: Secret Wars + Reign: Conflict of Nations for Dungeon Defenders
Borderlands for Serious Sam HD: First Encounter - Serious Sam HD: Second Encounter & The Ship?
Hi, what about C&C3 Kane's Wrath for your Killing Floor? Or Serious Sam 2 + Rome Total War for it? All is tradable.
Grand Theft Auto IV: The Ballad of Gay Tony for killing floor or left 4 dead 2?
Are you interested in some of these games ? I can do several for your Killing Floor ofc. But don't forget that the first list of games aren't redeemable on Steam, but they are on Uplay for example, so you'll get the game anyway.
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You can also make other offers.