Designed for Danger is a story-driven Portal 2 campaign (PTI map series). It consists of eight levels that provide players with one to two hours of playtime. It mixes regular puzzle chambers with story moments and exploration sections.
In the campaign, you assume the role of Chell during an early part of Portal 2. This time however, things turn out differently. The actions of a rogue force will set you on a new path through Aperture Laboratories.