You can save your progress by linking your account to the following applications.
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Facebook
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Google
Apple (iOS Only)
In case if you delete the application at any time or if you want to play from a different device, you can re-install and login with linked account to see your progress.
Important Note for Apple Users: If you are switching from an iOS device to an Android device, you need to link your account with Google or Facebook. Logging in with Apple only works on iOS devices.