Xbox Live Games with Gold for February 2015 Revealed
February will bring three new free games as part of the Xbox Live Games with Gold program. Xbox One owners will receive #IDARB, while Xbox 360 owners will get Brothers: A Tale Of Two Sons (February 15) and Sniper Elite V2 (February 28).
In order to benefit from this program, you need to be an active Xbox Live Gold subscriber, and to download the games in the given time frame. You can obtain a subscription from most retailers, or directly from your Xbox Dashboard.
Source: Major Nelson