As you know Facebook audience pay 5x more then Admob nowadays! More security related to earnings, since you separate your game in the store and earnings : not with Adsense but the plateform Facebook Developers.
Snake vs Block is a new game, The snake is made up of balls. The snake will grow longer when eating other coin balls food along the way.
The goal here is to collect as much food as you can to make your snake grow, while you are exploding the blocks toat are blocking your way.
Each time you hit a block, you lose a part of your snake. Going as far as possible is the main goal here !