After seemingly teasing a new announcement on the official Xbox Game Pass Twitter account the past few weeks, today it was revealed just what is now happening on the service.

Four new titles are hitting Xbox Game Pass starting today, and they're all appropriately horror-themed to celebrate Halloween. Observer, Hello Neighbor, Dead Island: Riptide, and Outlast are all currently available to download for free for those who are subscribed to Microsoft's game subscription service.

With this games now joining the service, that makes it eleven games this month that have hit Xbox Game Pass. Previous games that were added earlier in the month include Wolfenstein: The New Order, Metro Redux, Split/Second and the most noteworthy entry of all, Forza Horizon 4. It's been a great month for Xbox Game Pass and with November approaching so quickly, we'll likely get a new slate of titles added to the mix within the next couple of weeks.

Xbox Game Pass costs $9.99 a month to subscribe. If you sign up today though, you can get your first three months for that same price, or test it out via a 14-day free trial.