Google sign-in allows you to save your guest account or Facebook account progress to your Google account. You can save your progress by tapping on the "Sign in with Google" button from the settings menu in Match Factory. Players using a guest account, or who previously connected to their Facebook account, can continue playing with Google sign-in to keep their progress.

Only 1 Match Factory account can be saved to your Google account. This means if you connect your Facebook account to your Google account, it will not be possible to save your guest account progress to your Google account after.