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Crusader Kings II (Steam key) - 1 TF2 key.
Two Worlds II + Pirates of the Flying Fortress dlc (2 Steam keys) - 1 TF2 key.
Really Big Sky (Steam key) - 1 TF2 key.
Agricultural Simulator 2011: Extended Edition (Steam key) - 1 TF2 key.
Civilization 5 (tradable) - 2 TF2 keys.
agricultural simulator maybe, and at least your civ 5 isn't that free key everyone wants