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The Battle.net activation process is quite simple. First you need to create a Battle.net account by visiting the official website and clicking on "Create Account". Then log into your Battle.net account and click on "Add Game" to add the game you want to activate. Then enter the activation code that came with the game and follow the on-screen instructions to complete the activation process. Once activation is complete, you can download and install the game on your computer.

Battle.net Diablo III Global Play FAQ : Learn more about the new feature allowing to play Diablo III on Americas/Asia/Europe Regions from any Game key versions.

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