Finally, I think this is the first time they have made 2 great games free in the same month.
Sleeping Dog's free from January 1-15
Lara Croft and the Guardian of Light free from January 16-31.
Since the Xbox One has been released, I'm hoping they will continue to make better games free since they have less to lose.
Enjoy
I've actually been wanting to get Sleeping Dogs and its probably the newest game they've had for free.