We usually do not recommend restarting the game because you will lose all your previous progress and in-app purchases. However, if you would like to start over, please follow these steps:

1. Go to the game settings. 

2. Look for the "Delete Account" option.

3. Tap on it.

Please be aware that this will erase all your progress and you'll start again from Level 1. Make sure this is what you want before proceeding!