Buy Battlefield 3 : Back to Karkand CD Key Compare Prices
There are 21 offers ranging from 1.83€ to 14.62€.
For Origin Platform: Origin CD Keys, you have to download and install the Origin Software first from HERE) then you can activate the game on it. Once installed, start Origin, click on the Origin Tab and click on Redeem Product Code and just enter the key. The game will appear in your My games list.
You can download with the CD Key directly from the store or from the game's publisher website. Please follow the steps and instructions given by the store.
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