To play safely, it is recommended to use official platforms:
Distributing or using modified applications without the developer's permission can infringe on copyright laws. Official Alternatives
Hello Hero All Stars has reportedly been "quietly killed" or shut down by its developers, making many modded versions obsolete as they cannot connect to required game servers.
Using modded versions violates the game's Terms of Service , often leading to permanent account bans.
Downloading a "signed mod APK" for from third-party sites carries significant security and legal risks, and may not even work due to the game's current service status. Critical Considerations