You may be looking to start over for some reason and reset Hustle Castle back to a fresh and new installation. Unfortunately, there doesn’t seem to be any kind of reset button or place to unlink your account. What you can do is switch your account to something different which will need to have 2 account in Gmail or Facebook. Once you have switched Hustle Castle over to another account you can reinstall the app under the default Google account associated with your device as a fresh install.
How To Reset Hustle Castle
If you want a Hustle Castle reset this is what you do.
1. Go into Settings and tap the Account Management button.
2. Next select either the Google Play or Facebook option and choose something different then the default.
3. Uninstall the app, then re-install it from the Google Play, Itunes store or from a backup.
4. Now when you log in for the first time don’t use any of the same accounts that are connected and you should be able to reset and start fresh and new.