After going to sleep in the backrooms, There's a rare chance that a really, and I mean really rare glitch can happen while asleep that will lead you to this non-existent level. Depending on the type of person you are via Actions/Personality/or character in general. You'll end up in a certain level in that dream but will eventually after some time notice that somethings. Off. Finding that the level you are in is morphing together with other backrooms levels. Hence the name, It copies/morphs with other levels and depending on what kind of person you are, You may spawn in a safe or dangerous area of this Unstable level. But it's also called "The copycat level" for another reason However. Because once noticed here, You are already dead in 24 hours. And there's nearly no escape from here so pray that you get lucky and glitch into sub-level -♾️