Cloud Account feature
By playing these games while connected to Facebook, Game Center, or Google Play, your progress will be saved to a cloud account. You can continue your progress on another device running the same app if you sign into the same Facebook, Game Center, or Google Play account.
Games supporting the Cloud Account feature iOS (Facebook, Game Center) Android (Facebook, Google Play)
You can logout of Facebook, Game Center, or Google Play to access your local progress (different from cloud progress). If you need to transfer local progress, please use the Login feature to move your local progress to another device.
Game Center can be found in the device's Settings.
Google Play Account