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Polybius is the biggest video game urban legend. An arcade game that brainwashes its players with subliminal messages.
Most write it off as a glitchy version of the Atari game Tempest, but the CIA has a secret they don't want you to know about: MK Ultra. Brainwashing, mind control, LSD. Get ready 'cause this is some CreepyPasta served up Game Theory style!