Man, how long did it take for me to realize there is an X beside those notifications LOL
Super easy way to stop each game’s notification. (You have to do them all, but as they come in, stop them!)
1. Click your notifications link
2. On the post, the far right side has a circle and an X (hidden ;), click that X!
3. It asks you if you want to Turn Off the notifications for this game/app, click Turn Off.
4. BAM, you are done.