Dooble! is a funny game where you have to quickly tap the screen to raise the number on the bottom of the screen until it gets to the number on the top, then throw it up to hit such number before the game timer ends.
But be careful, sometimes a bomb shows up and it must not be hit by your number, nor you have to tap on the screen. Just tap the bomb to make it explode and earn a score point. If you’ll fail, you’ll lose a point.