An Xbox Live Gold subscription is required to get the free games.
Even if you don't own an Xbox One, you may want to pick up Gears of War 3. Although it is not currently on the list of Xbox 360 games that will work on Xbox One by way of backward compatibility, Microsoft has said that it will expand the list of supported titles by the time the new feature rolls out publicly this fall.
Plus, with Gears of War 4 coming next year, this is a good way to catch up on the story so far.
Gears of War 3 replaces the original Plants vs. Zombies, which was free July 1-15 on Xbox 360. Xbox One owners, meanwhile, can also download Ubisoft's Assassin's Creed IV: Black Flag for free all month long.
At school or work? Follow the links below to queue up your download right now.