https://www.gamespot.com/articles/forza-horizon-4-out-now-for-free-on-xbox-game-pass/1100-6462050/

Microsoft has announced the new additions to the Xbox Game Pass catalog for Xbox One for October, and they include some big-game titles. All subscribers will get to play seven more games in October, including the brand-new launch Forza Horizon 4 at launch on October 2. [Update: Forza Horizon 4 is out now on Game Pass, alongside the other new additions for October.]

Other games joining the Xbox Game Pass catalog in October include Wolfenstein: The New Order, Metro 2033 Redux, Westerado: Double Barreled, Lego Indiana Jones, Shantae: Half-Genie Hero, and Split/Second. As you might have noticed, some of these titles are Xbox 360 games, and these are backwards-compatible games that play on Xbox One.