If you would like to switch off notifications or prevent it from appearing on your Facebook Newsfeed, here are some steps you can follow.
To switch off Notifications on your iOS device: 

1. Go to Settings. 
2. Click on Notifications and scroll down to find Pearl's Peril. 
3. Switch off Notifications and change the Alert Style to 'none'.

Also ensure whilst playing that you uncheck the "Share" option before playing a scene.

To switch off Notifications from appearing on your Facebook Newsfeed:
Go to your Facebook Settings via your laptop or computer and select the Pearl's Peril App. There you can change the mode to "Only You", meaning no one else will see your progression or that you are playing the game.