The majority of the time, this two-story, wide-open space serves as the school cafeteria. The food line is on the first floor, with food served by buffet-style warming stations operated by the school's cafeteria crew. There are enough oval-shaped bench tables to seat the whole school over the remainder of the two floors, along with a few vending machines on the second floor serving branded products. The stairs in the cafeteria go in both directions, up and down, for easy movement between floors.

Controlled via the inaccessible admin areas of the school, the two rooms of the cafeteria can convert into an assembly hall with seating for hundreds, the floor slowly expanding upwards to make a series of bleacher-like seatings spread in a semi-circle around a viewing area complete with a large projector screen in the far wall, the warming stations for the food and tables for the students vanishing to accommodate. The lighting becomes moodier and more atmospheric than the bright and sterile cafeteria lights, and the windows facing outwards get covered by retractable dark foam walls that provide decent acoustics.

As a result of the tampering of the terrorists, the common area now switches between being the cafeteria and being the assembly hall every three hours on the dot. Students that remain inside the room during the shifts will suddenly feel nauseous to the point of having to close their eyes; after a few seconds, the feeling will slowly pass, and the room will have entirely transformed into the other configuration.