It’s a big day for Angry Birds lovers, with Rovio busting out a free upgrade today for iOS with 15 special levels to honor the game’s second birthday on December 11.

All episodes of the original Angry Birds game will be unlocked, so no matter how poorly you play the game, you can now take a peek into the first level of each episode. Whether you can climb up each level within those newly revealed episodes is entirely up to you.

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In addition, Rovio‘s teamed up with Barnes & Noble, and on December 11 from 11 a.m. to 3 p.m. there will be various special events such as scavenger hunts, high-score contests, designing Angry Birds characters, parades and guessing games in many of Barnes & Noble’s U.S. stores.

Toys “R” Us gets in on the fun, too, with discounts on Angry Birds plush toys, and that includes an unlock code for an Angry Birds Chrome “Seasons Greedings” bonus level.

This is starting to sound like the next Star Wars franchise. Rovio certainly does have a lot to celebrate with its Angry Birds games, explosively successful and contributing to the company’s astonishing value, which its CMO says is worth more than $1 billion. As of last month, fans have played 266 billion levels of the game, shot 400 billion birds and collected 44 billion stars. In fact, according to Rovio, people play Angry Birds for a combined 1.825 billion hours per month.

[mashable]

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