Nope! The first time you log in to Family Guy, the game will be saved using your device. Provided you do not delete the game, you will be able to access your save when you load it up.

However, setting up an account ensures you can access your game in the future, even if you lose access to your device. It will also protect you from losing your game if you experience a crash as well as allowing you to play on multiple devices. Because of this, we strongly encourage setting one up.