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Civ 5 - 3 keys
S.T.A.L.K.E.R.: Shadow of Chernobyl - 2 keys
S.T.A.L.K.E.R.: Clear Sky - 2 keys
SS3 bfg - 3 keys
C&3:Tiberium Wars - 2 keys
Command & Conquer 3: Kane's Wrath - 1 key
Only this link:
http://steamcommunity.com/id/leviscooldaddy/
KEY R.A.W. - 3 TF2 keys
KEY Sniper Elite: Nazi Zombie Army - 3 TF2 keys
KEY Primal Carnage - 2 TF2 keys
KEY Chivalry - 3 TF2 keys
GIFT Bastion - 2 tf2 keys or 1 tf2 key + 3 cards that Bastion drops (only for people with +50 rep)
any of:
Shoot Many Robots - 2 keys
Terraria - 1.5 keys
Ace of Spades - 1.5 Keys
Sid Meier's Civilization IV x2 - 2 tf2 keys
5x Just Cause 2 DLC (Bull's Eye Assault Rifle, Rico's Signature Gun DLC, Monster Truck DLC, Chevalier Classic, Black Market Boom Pack DLC ) - 2 keys for all 5