We point out that Facebook Connect is recommended, otherwise, you risk losing the in-game progress.
 

Here’s what you should do to retrieve the lost progress:
1. Make sure you are connected to the Facebook account you used for saving the in-game progress.
2. If the previous step doesn't help, please contact us and provide us with some additional information:
  • What is your e-mail address?
  • When did you log in to your account the last time?