What the sources establish
The supplied material includes a full walkthrough whose title explicitly covers the ending. In the official objective, the required pieces are four keys and one code; use these as the completion checklist before expecting the exit sequence to progress.
Use the evidence carefully
This page avoids publishing an unverified code or claiming that every ending condition is permanent. Watch the ending segment in the cited walkthrough, then follow the live prompts in your current game version.
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.