What the sources establish
Four keys are part of the official escape objective. The supplied corpus includes full walkthrough and key-location videos, so use them to compare rooms, props, and route order visually while you search in your own run.
Use the evidence carefully
The supplied text does not establish a permanent written coordinate list for all keys. If a location differs, do not assume the game is broken—confirm the current layout and use the developer's bug-report route only for a reproducible problem.
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.