Hub

"How can you fail at this? It isn't even a test."

- GLaDOS

The Hub is a large area which test chamber doors are arranged around.

Overview
Throughout the cooperative campaign of Portal 2, ATLAS and P-body are to use the Hub in order to select Test Chambers from each courses that are desired.

After completing a course, the next is opened, allowing access to more chambers. Each course's entrance is connected by lines of circles, the same used to indicate what something might activate, and turns yellow when active. In cases where one player has opened more courses than the other, it defaults to the more-experienced player.

The Hub is a towering room of platforms, Aerial Faith Plates, and Hard Light Bridges navigable with the Portal Gun. The courses, in order, are called: "Team Building," "Mass and Velocity," "Hard Light Surfaces," "Excursion Funnels," and "Mobility Gels."

A large screen features both separate and combined information of the players, including how many steps each has taken, number of portals placed, disasters averted, collaboration points, numbers of times they hugged, and so on.

List of appearances

 * Portal 2

Trivia

 * The Hub was originally linear, with all courses open from the beginning. The intent was to let players move on to other courses should the ones they're attempting frustrate them. However, this confused players, so the developers opted for a linear path of courses.