If your device says its registered and wont let you sign in.
1. Press the "Home" button to return to the home screen.
2. Go to "Settings" - which is found by hitting the "Menu" button or in the "Menu Page".
---> Then go to "Manage Apps."
3. Click on "Haypi"
---> Then click the "Clear Data" button
---> Then click the "Force stop" button
---> Then click the "Uninstall" button.
4. Return to "Home Page"
---> Open "Android Market" and Re-Download "Haypi Kingdom".
Now you should be able to log into your account. If I'm anything isn't clear or you can't find one of the steps, let me know and I will be more than happy to help. I hope this helps, thanks and take care.