Feb 6, 2011 13:42 GMT  ·  By

Rovio has released new versions of Angry Birds and Angry Birds HD for iPhone, iPod touch, and iPad, adding a brand new set of levels, a new golden egg and more. The update is free for all existing players.

The Angry Birds iTunes page reveals that version 1.5.1 is now available, packing the following new additions:

What's New in Version 1.5.1

HAM 'EM HIGH CONTINUES – ANOTHER SEARING UPDATE Angry Birds is back with a brand new update!

New Features in version 1.5.1: - ADVENTURES IN THE FRONTIER BADLANDS CONTINUE - 15 NEW LEVELS – ALL CRAZIER THAN POPCORN ON A HOT STOVE - A NEW GOLDEN EGG THAT IS AS MAD AS A BAG OF HAMMERS

Rovio claims that fans of the game will be able to find a hidden clue in the Rio Movie Commercial which airs during the fourth quarter of the Super Bowl. The clue will allow players to unlock a special level of Angry Birds, the developer claims.

“In version 1.5.0, we introduced the Mighty Eagle downloadable content. If you get stuck in the game, you have the opportunity to purchase a can of sardines, which you use to lure out the elusive Mighty Eagle,” the what’s-new continues on the Angry Birds iTunes page.

An in-app purchase in Angry Birds, Mighty Eagle costs $0.99/£0.59/€0.79 to download. It is a one-time purchase.

“Mighty Eagle includes all new gameplay goals and achievements! In each level that you already cleared using the regular birds, you can smash away freely and try to fill up the destruction gauge! If you want to smash your way through every level leaving nothing behind, you have every incentive to do so!”, adds Rovio.

The company concludes its announcement, adding:

“We’d like to take this opportunity to extend our infinite gratitude to friends of our fierce birds everywhere. We thank you sincerely from the bottoms of our fluffy hearts for making Angry Birds the highest rated and best selling game ever on iTunes!”

Download Angry Birds for iPhone

Download Angry Birds HD for iPad