Microsoft will offer Xbox Live Gold subscribers four free games to download during the month of August 2015 as part of its ongoing Games with Gold program. Two of the games will be for the Xbox One and the other two are for the Xbox 360.
For the entire month of August, Xbox One owners with Xbox Live Gold can download Metal Gear Solid V: Ground Zeroes for free. The action game was designed to be a short prologue to developer Kojima Productions's main game, Metal Gear Solid V: The Phantom Pain, which will be released for the Xbox One on September 1 by publisher Konami. From August 16 to September 15, Xbox One owners can also get How to Survive: Storm Warning Edition, a zombie-themed survival game from developer Eko Software and publisher 505 Games.
Xbox 360 owners with Xbox Live Gold can download 4A Games' post-apocalypse first person shooter Metro 2033 for free from August 1-15. Then they can get the sequel, Metro: Last Light, for free from August 16-31.
Source: Major Nelson