+Completely free game.
+Funny challenging different levels.
+Simple & beautiful, HD graphics.
+interesting simple controls - swipe to throw, touch to boost!
+Hidden bonus levels!
+Awesome powerups! Pump up your birds chiken for maximum damage.
+New Strong crazy bird, angry chicken, crazy chicken items added.
Shoot the crazy bird, knock down angry chicken with different slingshot.
Knock Birds on Down game is suitable for all ages
Try to keep your planet strong for as long as possible in order to get the highest score!
So just download and enjoy this interesting world.