Hello. I’m from brazil and I can say that some aspects of brazil are a mess. One of these is Game Rating.
For years Apple Store did not show games section for Brazilians due to the ridiculous rules for game rating. Now things changed a bit, but if you want to make your Windows Phone App available on Brazilian market, you must follow some steps. (I figured out that when my first ported game was not found on brazilian wp store - http://www.windowsphone.com/en-us/store/app/uphills-beetle/b628af19-f315-4f6b-a02f-e3bdb61d407a ))
Searching about this I found this article that explains how to overpass this bureaucracy:
http://www.windowscentral.com/brazil-wp-certification-guide
Brazil is a huge market that can’t be forgotten.