The school is mentioned by Pink Tool in Petscop 7, who states that Marvin "ALSO WANTS 1000 PIECES FOR “MACHINE BEYOND SCHOOL BASEMENT STAIRWAY"". The note in Care's Room briefly mentions "A young person walks into your school building" in reference to "You".
The school is first visited in Petscop 11, when the player explores it in the Demo Area, it appears to be in a very out of place first person perspective. The school's interior is filled with lockers and several doors. The Green Tool, Marvin, and the Needles Piano are encountered in the school, as is a locker secured with a padlock which the Demo mode player is unable to open.