Tap Install and grant the application storage permissions so it can save your custom maps locally.
These fan-made engines (often based on older frameworks like "Mario World Engine" or "The Turbo Brothers' engine") are not official. Version numbers like "4.0.0" are arbitrarily assigned by modders to imply progress and legitimacy. Users who download such files risk exposing their devices to malware, data theft, or compatibility issues, as these APKs are not vetted by Google Play Protect. While some fan engines are harmless tributes, the specific "4.0.0" variant has no verifiable official source, making it a dangerous or fraudulent download. super mario maker world engine 4.0 0 apk