It's said to be the 80s arcade game that spawned an urban legend. Polybius was rumoured to be so addictive it caused severe side effects in those who played it. Those players were said to be part of a secret US government conspiracy to try and control their minds. But how much of the Polybius tale is true? And why is it still leaving an impression on popular culture today?

Video by Lee Johnson, Adam Proctor and Dan John

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