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Polybius is a fictitious arcade game that originated from an urban legend created in 2000. The urban legend is that the game was part of a government-run crowdsourced psychology experiment during the early 80's, with gameplay producing intense psychoactive and addictive effects in the player. These few publicly staged arcade machines were said to have been visited periodically by men in black for the purpose of data-mining the machines and analyzing these effects. Finally, all of these Polybius arcade machines allegedly disappeared from the arcade market.