Rovio is delighted to announce the 2nd birthday of Angry Birds, which will be celebrated all over the world on December 11.

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 achievements. As a birthday gift to fans, all episodes are now unlocked. In addition, the new Rovio channel gives fans instant access to their favorite content. News, games, videos, Facebook, Angry Birds shop, and other great content are only one tap away.

Fans in the US can celebrate Angry Birds’ second birthday by heading over to their local Barnes & Noble, which will have special events and giveaways from 11 AM to 3 PM on December 11.

Toys ‘R’ Us is also getting into the “birdday” spirit. Fans who go to the store on December 11 can get 25% off Angry Birds plush toys plus a code that unlocks an Angry Birds Chrome Seasons’ Greedings bonus level.

For Angry Birds fans in Japan, Rovio CMO and Mighty Eagle Peter Vesterbacka will be giving a special presentation at the Apple store in Ginza. Vesterbacka will share stories about how Rovio took Angry Birds from just another mobile game to a worldwide entertainment success story and how the App Store was involved. In Harajuku, Tokyo, an Angry Birds event will give fans a chance to play games and win prizes.

Although Angry Birds is only two years young, it has already been downloaded 500 million times, making it the most popular app ever as well as one of the fastest growing international brands.