Open your Chromecast app, select your device, open the menu in the upper right, select "Check for offers". There are currently 5 items you can choose from for free, among them are $6 added to your Google Play account or a free HD copy of the first X Men movie.
Enjoy.
Update: It actually appears that you can choose ALL offers if you want them. I was under the impression you could choose only one out of the 5 offers, but I was able to get both the X Men movie and the $6 credit to my Google Play account.
Enjoy.
Update: It actually appears that you can choose ALL offers if you want them. I was under the impression you could choose only one out of the 5 offers, but I was able to get both the X Men movie and the $6 credit to my Google Play account.
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