To celebrate Angry Birds' second birthday, Rovio has updated its ever popular game to version 2.0. Angry Birds was originally released back in December 2009 and has become a huge franchise.

Fans everywhere can enjoy a new “Happy Birdday” update for Angry Birds, which features 15 delectable new birthday cake levels, spiffy new menus and graphics, and special birthday achievements. As a birthday gift to our fans, all episodes are now unlocked!

The new update is free and covers Angry Birds for the iPhone and iPod touch as well as Angry Birds HD for the iPad. If you haven’t played Angry Birds yet, you can buy the game for $0.99.