characters. Similarly, the robotic enemies the player frequently fights will often say, "First law disabled" before attacking the player. The 1995 graphic adventure game Robot City is largely based around the three laws. The main character, Derec, is stranded in a city built and inhabited by robots with the exception of two humans, one of whom has been murdered. Because of the first law, this leaves Derec as a prime suspect. In order to prove his innocence, he must find the culprit. He often uses the three laws to aid him in his investigation. For example, a robot might not let him into a certain area because it has been ordered not to (it is following the second law). However, if he tells the robot that the real murderer is chasing him then the robot will let him enter; failure to do so would constitute allowing harm to come to a human through inaction (the first law takes priority over the second). The video games Mega Man 7 and Mega Man X reference Asimov. In Mega Man 7, Mega Man seemingly attempts to break the First Law in order to kill the mad scientist Dr. Wily. When Dr. Wily reminds him of the First Law, in the Japanese original, Mega Man obediently puts down his Buster and is silent; however, in the English version, he claims to be "more than a robot" and again attempts to kill Wily, but is thwarted when Wily's fortress begins collapsing. In Mega Man X, Dr. Light creates Mega Man X, an android that is not bound by the Three Laws. Dr. Light fears that X's free will will cause him to be destructive after breaking the First Law, and seals X away in stasis to morally train him for 100 years. In Mega Man X6, one of the Maverick bosses, Shield Sheldon, was known to have taken his own life for failing in his purpose, which breaks the Third Law, though this is implied to be more out of shame than because of the laws. The character Zero, at the end of Mega Man Zero 4, applies the Zeroth Law on Doctor Weil, a tyrannic murder, to save the world. In the role-playing game Paranoia, the robots are guided by a set of similar laws, except the rules stress the importance of The Computer. The laws are enforced by "asimov circuits"; bots whose circuits