Polybius

Anyone familiar with this arcade game? It's an entertaining thought, at the very least. It's a bit of an urban legend. A game released in 1981 by an unknown company, and only released to a limited number of arcades around the Portland, Oregon area. Players were said to suffer amnesia after playing, forgetting their own names and basic information about themselves. It is also said that they would have terrible nightmares, and wake up screaming in horror. A more entertaining thought is that it is claimed that men in black suits would come collect information about the machine (high scores, machine settings, and whatnot) and leave without taking any money from the machine. Nobody has found any proof of the game's existance, with the exception of a screenshot displaying "Polybius" and the name of a nonexistant game company copyright with a german name meaning "mind deletion."

Truth or not, at the very least it's interesting, I think. Anyone ever hear of it, or know anything more about it?