21.03.2016 21:00
Nowadays there is no option how you can reset your account and save gems that you have collected on the other acc. Developers removed this feature and it wouldn't be returned. You can only create a new Gmail account and add it to your device settings to start a new game with an empty castle. For this sake, enter Settings in the game. Push on the Switch button, as it shown on the picture below, and select an account, which you have created earlier. Remember, you won't get extra gems as a new player when you create additional accounts.
If have problems with an empty castle after logging in, then you should check if your device is still linked your account. Otherwise, try to switch from Guest to your main acc and re-link it.