Hub

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

- GLaDOS after falling into the acid at the bottom of The Hub.

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

Overview
In Portal 2's co-op mode, Atlas and P-body use the Hub to go to test chambers. Doors to test chambers you already completed are unlocked, and doors to chambers you have not yet unlocked are closed. The Hub is a towering room of platforms and bridges navigable with the Portal Gun, with acid at the bottom. The first set of tests (chapters) are called "Team Building", the second set is called "Mass and Velocity" and the third is called "Hard Light Surfaces".

List of appearances

 * Portal 2