Once the game is linked to Facebook, you can activate invisible mode. Invisible mode allows you to:

- Hide the fact you're connected to Facebook from other players
- Hide your Facebook name: your game name will always be shown

Other players will only be able to add you as a friend using an invitation code, and the same will be true for you.
In invisible mode, as when connected to Facebook normally, you can use your Facebook avatar, as well as transferring or restoring your progress.