Angry Birds (v1.2.1)
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At the beginning you're only given one type of bird that does nothing more than just headbutting, but throughout the game you'll come across six more birds, each possessing one special power: multiply, explode, accelerate, dropping egg bombs, boomerang, and extra strength. Don't worry, the instructions are pretty clear when you first meet these enhanced kamikaze birds -- most involve just a single tap anywhere to trigger their special abilities mid-flight. Once you get the hang of it, you'll soon be wanting to try out all sorts of trajectories to take vengeance on those cheeky green hogs. Seriously, the pigs really do laugh at you when your birds miss them.