The Cafeteria is a building at Kadic. It is where our heroes, as well as the other kids eat. According to the students it's food is okay. X.A.N.A. tried to collapse it in Just in Time . In Claustrophobia he tried and killing Ulrich, Odd, Theo, Herb, Sissi, Nicholas, Tamiya, and Milly by electrocuting it.
Interestingly, this is the only building which doesn't fit with Kadic's original model, the college Lakanal. In the real world, the cafeteria isn't in this place: in fact, the outdoor view from the cafeteria is an existing building, but way too small to be a refectory (it's a study room).