Greetings,
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To start an entirely new game with your Android device, all you need to do is restart as follows:
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Exit the game, and locate its icon in your device settings under 'Apps'
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Tap on the game, then press 'Uninstall'
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Restart your device
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Go to Play Store, reinstall the game and start it up
Remember, connecting your new game to Google Play will prompt you to load any game already associated with your Google Play account. To back up your new game via Google Play, you may need to create an entirely new Google Play account, too.
Best,