Because this is a modified APK and not available on official app stores, it must be installed manually:

: Once installed, you can open the app and begin playing immediately without any in-app purchases. Safety Note

: Includes characters ranging from classic ninjas to newer additions like Boruto and Kawaki.

: Players can unlock a "Hardcore Mode" by winning 10 rounds each with three different ninjas (total of 30 wins). Gameplay Mechanics

: Go to your Android device settings and allow installations from "Unknown Sources."