For those who might not be able to figure out how to "add" the game, click here and pick from the drop downs after you've already registered.
Here is the register link you will have to verify your account in your email when done. http://fr.thq.com/fr/mythq/register
http://fr.thq.com/fr/mythq/mygames
Etape 1: Xbox 360
Etape 2: Metro 2033
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Then hit the yellow button in bottom right.
skip the code thing and when you submit
you get a code for xbox for the mask simple