Certification tips
Your first stop should be the certification requirements page, which lists all of the current requirements your game will be tested for: http://msdn.microsoft.com/en-us/library/windows/apps/hh694083.aspx.
There are some requirements that you should take note of, and in this section we'll take a look at ways to help ensure you pass those requirements.
Privacy
The first of course is the privacy policy. As mentioned before, if your game collects any sort of personal information, you will need that policy in two places:
In full text within the game
Accessible through an Internet link
The default app template generated by Visual Studio automatically enables the Internet capability, and by simply having that enabled you require a privacy policy. If you aren't connecting to the Internet at all in your game, you should always ensure that none of the Internet options are enabled before you package your game.
If you share any personal information, then you need to provide players with...