Four free games
Microsoft has announced October 2015's lineup of free games for Xbox One and Xbox 360. Provided you're an Xbox Live subscriber, you can get four free games next month spread across the two platforms.
Xbox One owners get Valiant Hearts: The Great War and Telltale's The Walking Dead (complete first season), while Xbox 360 users can pick up Metal Gear Solid V: Ground Zeroes and The Walking Dead (complete first season). See the image below for a rundown of the free games and when they will be available
Even if you don't have an Xbox 360, it's probably still worth picking up the last-generation games, as they could one day be made playable on Xbox One through backwards compatibility.
October 2015 Games With Gold Lineup
Valiant Hearts: The Great War (October 1-31)
The Walking Dead (October 16-November 15)
Metal Gear Solid V: Ground Zeroes (October 1-15)
The Walking Dead (October 16-31)
In the meantime, it's not too late to still grab some of September's free games, including Tomb Raider: Definitive Edition, Battlestations: Pacific, and Crysis 3.