If you want to turn off the game notifications on your device, please follow these steps:
1. Open Settings -> Additional settings.
2. Scroll down and untick the notifications you don't want to receive.
3. Restart the game to apply the new settings.

You can also turn off all notifications at once in your device settings:
1. Open Settings.
2. Find the game in the application list and select it.
3. Go to Notifications (right side of the screen) and turn off Allow Notifications.