Chiller is one NES game that many owners of the console never saw. Originally released in the arcades in 1986 and then ported to the NES in 1990, Chiller is a light gun game unlike any other.
In the console version, players kill monsters in five stages, which is different than the arcade game where players tortured people strapped in various medieval devices. Still, for an NES game, it's quite graphic.
The reason why NES owners didn't get their hands on a copy of Chiller back in the 90s was that it was an unlicensed game, and unlicensed games meant (and mean) BIG money.
A copy of the game with a box, not even brand new, went for $124 last month.