To toggle app notifications between on and off:
- Go to your Facebook Home Page
- Check the left hand portion of your News Feed for a section named Apps
- Hover your mouse pointer over the name of the app, then click on the gear icon that appears on its left
- Select Edit Settings and click the drop down menu for notifications and select your desired option
If a friend is sending you too many app or game invites, you can go to your blocking settings and type the friend's name into the Block app invites section. Learn more about adjusting your notifications.