Polybius is a supposed arcade game featured in an Internet urban legend. According to the story, the Tempest-style game was released to the public in 1981, and caused its players to go insane, causing them to suffer from intense stress, horrific nightmares, and even suicidal tendencies. A short time after its release, it supposedly disappeared without a trace. Not much evidence for the existence of such a game has ever been discovered.
