Danger Zone

Danger Zone is an episode of Angry Birds Space featuring 30 extremely challenging — brainteaser-like — levels. According to Samsung, this episode will be available as an in-app purchase (for which platforms is unclear at this time). Samsung Galaxy users will be able to access this episode free for 3 months from launch date.

It is revealed in several videos from SXSW that the level numbering is "D-1" through "D-30", implying that Danger Zone is a nonsequential episode.

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