Check the download source
Use the official download page at masterslotsgame.com. Do not trust an unsolicited APK shared by an account claiming support or early access.
Review the release details
The Download page lists the APK filename, file size and SHA-256 checksum. Check those details before installing. The version and minimum Android version have not been supplied.
Keep device protections enabled
Android may request permission for the browser to install a downloaded file. Review that permission and revoke it after installation if you prefer. Do not bypass a device security warning.