iOS - uninstall the App, goto your game center and create a new ID. Then download the app again with the new game center ID. If you need cross platform, link it with facebook.
Android - uninstall the App, goto accounts in settings and setup a new account. Download and install the App again and log in using the new account. Link with faecbook if you need cross platform.
Note - you might not need to uninstall the app (you could log-out) but i'm not sure if the saved data on the app has any account information (i.e. auto link to your existing account/previously logged in account). So i stated a longer process that should be 100% fool proof.



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