Bureaucracy - The Switchgear Rooms

To find your way through, insert the unlabelled cartridge in the
computer. I hope you made a note of the order you found the
stickers in... You did? Great! Type in PRINTB etc in the order you
found the stickers. The screen will gradually fill up with what
looks like a load of gobbledegook.

Read the writing on the screen from top to bottom of the screen,
from left to right. The message is:
To find the entrance to Headquarters, upon entering the first
numbered room, go in any direction. Thenceforth subtract the
number of the previous room from the difference and if it is zero
go east, if one go south, if two go up, if three go north, if four
go down, if five go west. eg if the first is 64 and the second
105, the difference is 41. Last digit is 1, so go south. Failure
will return you to the antechamber.

Follow these instructions and you'll be okay!