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Downloading and installing digital copies of Call of Duty: Modern Warfare
1
Launch the Battle app and log in to your account.
2
Select All Games.
3
Find and select Call of Duty: Modern Warfare.
4
Select the Install button to download and install the game.
Yes, you can play both the campaign mode and multiplayer mode in Call of Duty: Modern Warfare 3 offline. The campaign mode can be played in its entirety in offline mode, and a Private Multiplayer mode allows you to access all of the maps and modes present in Multiplayer.