1) "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." Source and further information: http://en.wikipedia.org/wiki/Polybius_(game%29 2) "Polybius: This game had a very limited release, one or two backwater arcades in a suburb of Portland. The history of this game is cloudy, there were all kinds of strange stories about how kids who played it got amnesia afterwards, couldn't remember their name or where they lived, etc. The bizarre rumors about this game are that it was supposedly developed by some kind of weird military tech offshoot group, used some kind of proprietary behavior modification algorithms developed for the CIA or something, kids who played it woke up at night screaming, having horrible nightmares. No arcade game called Polybius induced amnesia, caused gamers to wake up screaming in the middle of the night, or attracted the attention of mysterious "men in black" who periodically came to "collect records" from Portland-area machines. This one is just a gag someone invented several years ago which has now become enshrined on the web, another version of the conspiracy rumors involving military intelligence agents visiting arcades to collect stored information from game consoles which date to at least the early 1980s. (Back then we were supposed to watch out for men in black who came around to take down the initials of high scorers at Space Invaders, Asteroids, and Defender.) " Source and further information: http://www.snopes.com/inboxer/hoaxes/roundup.asp