The Vault 8166 rumor is a claim that there exists a game server on ROBLOX ran by unknown hackers, scammers, or exploiters that is used to watch or monitor activity between users on the rest of the website. This alleged server is also referred to as "a secret hacker facility" or "the Area 51 of ROBLOX" but the origin of the name is not known.

There are many fan-made stories, videos, images, and games that resemble Vault 8166.

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