Call of Duty: Modern War 2 Steam CD Key Call of Duty: The serial number or product code that activates Modern Warfare 2, normally a combination of letters and numbers on a label inside the game’s case or printed on the game’s quick reference card. Call of Duty: Modern Warfare 2 Steam CD Key is used to save and activate the related game. Depending on the product, SCDKey.com provides this in the form of scanning the code or the actual code in text format.
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