Guest 666 is an old Roblox legend and creepypasta who was rumored to have abilities which regular guests did not have, such as being able to speak in games, and use admin commands. This legend has existed since the creation of guests in 2008, but became popularized in 2017 when the Roblox YouTuber "ObliviousHD" would create a series about Guest 666. Since the removal of guests in 2017, the Guest 666 rumor has largely died down.