Polybius: Mind experiment or urban legend?

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 and horrific nightmares. A short time after its release, it supposedly disappeared without a trace. No evidence for the existence of such a game has ever been discovered.

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Polybius was born around 203BC in Megalopolis, Arcadia which at that time was an active member of the Achaean League.