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Serious sam first, second, random encounter and double D(all 4 are tradable gifts) for civ 5?
Gifts Might & Magic Heroes VI Pirates of the Savage Sea DLC and Danse Macabre DLC for Civ 5 ?
Left for Dead 2 for Civ V? L4D2 is a great shooter with 4 player co-op campaign (up to 8 with mods) as well as 4 vs 4 modes.