Isn’t it annoying when you get a
notification for game request on Facebook? Yes it is really irritating and
boring. You do not play any of the game but your friend keeps sending you a game
request to get extra gems or coins.
There is a kind of hidden feature in Facebook where you can block all the game request that your friend keeps on sending
image source: 9GAG 
They keep on sending these games request
so much that you’d like to block them on Facebook. But don’t worry; you don’t have
to block them. There is an easy way to block these game requests forever.
There is a kind of hidden feature in Facebook
where you can block all the game request that your friend keeps on sending. All
you have to do is enable this option for once and from next time there will not
be any kind of game or app request you will be receiving.
How to Block Game request on Facebook from iPhone

1: Launch Facebook app and tap on More
Launch Facebook app and tap on More
2: Tap Settings — Account Settings
Tap Settings -- Account Settings
3: Go to Apps – Platform and check “No”
Tap Settings -- Account Settings
Now you need to re-login your account to
make it work. That’s it! You will no longer receive any kind of game request next
time you launch Facebook app.
Note: You can also block game request or invitation on Facebook from web or Android as well with same procedure.