The band Fall Out Boy announced on their photo credit they are releasing their own version of the popular iOS and Android game Flappy Bird.
If you're aware of what Flappy Bird is (and you should since it's been plastered all over the place) then you'll be very familiar with with game. If not, you basically navigate a bird through obsticals and see how far you can get before crashing into something. Tap the screen and the bird goes up, let go of the screen and the bird drops. Simple right?
The game should hit iTunes and Google Play once approved by those respected parties.