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, you may be referring to a short "horror" ROM hack created by Realjefftastic
If you are looking for a write-up on the viral horror experience, this mod—created by jefftastic —is a "creepypasta" style reimagining of the classic game.
This article explores the world of Super Mario 64 ROMs, covering the technology, the thriving ROM hacking scene, and the legal landscape surrounding them. What is a Super Mario 64 Z64 ROM?