Because these are fan ports, you may encounter bugs:

You won’t find Hello Neighbor Alpha 3 on the Google Play Store or Apple App Store. Those stores host the final, stable releases. So, where did the mobile community turn? GameJolt.

GameJolt is a digital distribution platform known for indie games, fangames, and—crucially—unofficial ports. For years, the search term "Hello Neighbor Alpha 3 Mobile GameJolt" has been one of the top queries for horror fans on a budget. Why?

Let’s set expectations. Even if you find a clean file, the experience will be rough.