Danger Zone

Danger Zone is an episode of Angry Birds Space featuring 30 extremely challenging — brainteaser-like — levels. For iOS, this episode is available as an in-app purchase, with the first level free for trial. Samsung Android users can access this episode free for 3 months from launch date. The episode is available for PC users (cost-included), accessible after passing all 30 levels of Pig Bang.

The level numbering is "D-1" through "D-30", implying that Danger Zone is a nonsequential episode.

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Read more: http://www.angrybirdsnest.com/angry-birds-space-gameplay/