https://techcrunch.com/2019/09/16/apple-arcade-is-now-available-for-some-ios-13-beta-users/

If you’re running a beta version of iOS 13 or 13.1, chances are you can now open the App Store and subscribe to Apple Arcade. The company has been rolling out its new subscription service, as MacRumors spotted. It works on my iPhone running a public beta version of iOS 13.1.

Apple Arcade requires iOS 13, tvOS 13 or macOS Catalina, which means that you won’t be able to access the service before updating to the new major versions of the operating systems. The final version of iOS 13 is set to launch on Thursday on the iPhone.