Microsoft Store (via Japan/Korea Argentina or US Microsoft Store) has select Xbox 360/Xbox One Digital Games for Free listed below.
Note must be logged into your Microsoft account. You may use Google translate to English before purchase to verify offer for the Japan/Korea or Argentina stores.
Available:
Star Wars Jedi Starfighter (Xbox 360/Xbox One Digital Game)
Note: Also available via the Microsoft Argentina store page
The Maw (Xbox 360/Xbox One Digital Game)
Note: Only available through the Microsoft Japan/Korea store