Good grief! Charlie Brown has, as luck would have it, noclipped into the Backrooms where it's nothing but the stink of old moist carpet and the madness of mono-yellow... or so it seemed at first.
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Video game is Garry's Mod (GMod).
Recorded with Xbox Gamebar Recorder (recorded 12/11/2023).

No music in this video is meant as a violation of copyright and is responsibility of add-on providers on Steam Engine.