Rovio is giving you quite the Christmas present this week, as an update to Angry Birds HD has just been released. Among the new content is Game Center support, the mighty eagle who has come to bring vengeance against those filthy swine and a golden egg. Perhaps the most important update, though, is the inclusion of 15 brand new levels.

We haven’t tried out the new stages for ourselves yet but if previous levels in the game are any indication then they’re filled with tricky shots that will make you want to pull out your hair right up until the moment you finally take out the last pig. For those who are tired of the frustration Rovio has finally made the mythical mighty eagle available, a bird which can clear an entire level in a single shot. There’s a catch though, as you must pay real money in order to buy a can of sardines to activate the eagle, and each activation counts as a separate transaction. The good news is that if you manage to return to a level you used the eagle on and clear it via the standard compliment of birds you get your sardines back and can use them again later without having to pay for another can.

Right now the update is only available for the iPad version of the game, but we have every reason to believe that the iPhone update should become available before the App Store closes down shop for the holiday break. Just make sure to keep an eye on the updates section of your iPad or iPhone over the next few days and be sure to grab this update as soon as you can. Personally I plan on not telling my wife about this update until after Christmas, because once she finds out there are more Angry Birds levels and a way to pass the stages she can’t clear I’ll probably never get my iPad back.

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[via TiPb]