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When you think of games you can't miss Angry Birds, and the latest version is the best of the series by far. The birds move to space in Angry Birds Space, and the addition of multiple gravity wells make it the toughest version to date.
The gameplay requires careful thought, more so than past versions, and the game makes passing time on the iPad a real joy.
$2.99, with additional levels available through in-app purchase for $0.99.