Don't forget to save your account! In the event of having to reinstall the game or switch devices, you'll need to have a way to recover your progress so that you don't have to start over from nothing.

You can accomplish this via either connecting to Google Play or Game Center, depending on your device type.

Simply tap on your profile picture in the upper left corner of the screen and then tap on the Settings button. Once you scroll down on the settings screen, you should see a Sign in button that you can use to connect to either Google Play or Game Center.

After doing this, you'll always be able to recover your progress by simply following these same steps to login once again.