What the sources establish
The official description calls the setting an abandoned network of corridors. The source corpus contains gameplay footage, not an official labelled floor plan, so the most reliable approach is to use landmark rooms, locked paths, and return routes while watching a real walkthrough alongside your run.
Use the evidence carefully
A community video frame is a visual reference, not proof of a fixed spawn or route. Keep your own route notes and re-check after updates or when a room differs from the video.
Source note
This guide is based on the supplied MONOCHROME research corpus and the live Roblox game description. Video material is used as a real gameplay reference; it is not presented as an official patch note.