1x1x1x1 (now known as roblox_user_81619) is a popular ROBLOX urban legend, fabled to be an infamous hacker on ROBLOX. There have been many misconceptions about the account that have existed for many years, and due to this, some have considered 1x1x1x1 to be a myth due to rumors of the account being that of a somewhat mysterious exploiter or hacker, some even claiming he had involvement with the 2012 April Fools Hacks. Though the rumors behind the account have been debunked, many Roblox users continue to believe them. While 1x1x1x1 is mainly considered a hacker, some may consider him to be a myth due to his mysterious nature.