Q&A for How to Disable Game Center

Hold down on the game until your apps begin shaking, then an "X" will appear in the corner, click it, and then confirm that you want to delete it.

You can always take the battery out of your phone and reinsert it and turn the phone back on. Then I would recommend deleting the game from your phone.

Turn off your Game Center in the Settings. It will make the game be brand new and not connected to your old account.

You can't.