Buy COD Black Ops 2 dlc Revolution CD Key Compare Prices
Requires a Russian IP address or you must activate it with a VPN. Might have languages restrictions or language packs. Read the description on the store game page. Most of the stores offer you their help, or show you how to do this with a tutorial to follow.
For Steam Platform: Steam CD Keys (Region Free / Worldwide), you must download and register the code on the Steam Client, you can Download it (HERE). Then once you login, click Add a Game (located in the bottom Left corner) -> Activate a Product on Steam. There type in your CD Key and the game will be activated and added to your Steam account game library.
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