It's difficult to determine the most downloaded game in iOS accurately as the rankings change frequently, and Apple doesn't publish the exact numbers of downloads. However, based on the latest trends and analysis, the most popular games in iOS are currently Among Us, Pokemon Go, Candy Crush Saga, PUBG, and Fortnite. These games have retained their popularity among iOS users and continue to receive updates and new features. If you're interested in keeping track of the latest game rankings, you can check the App Store's "top charts" section or use third-party apps that provide real-time insights on app downloads and usage.