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Once again, the green pigs have stolen the birds' eggs, and you must get your revenge. By that, we mean slingshot various types of birds into pigs' hideouts, which are fortified by an ever-increasing number of ice, wood and stone blocks.
Angry Birds was a huge hit on iPhone and Android, and it definitely has the same addictive gameplay as the mobile versions; it'll be interesting to see how it fares in the desktop world.