Monsteropolis

Monsteropolis is a location mentioned in the North American instruction manual and box of the first Mega Man video game. It is described as a strange multi-layered land of robot-like Humanoids created by the wrongly-performed experiments with human beings by Dr. Wily. It contains seven heavily-guarded empires led by Cut Man, Guts Man, Ice Man, Bomb Man, Fire Man, Elec Man, and Dr. Wily.

Monsteropolis is not canon, and except for some English media related to the first game, like The Official Guide to Mega Man and the Mega Man Anniversary Collection manual, it is not mentioned again in game sources.

Other media
The main setting of the Mega Man comic by Dreamwave Productions, Mega City, was formerly known as "Monstropolis".

In the cartoon Captain N: The Game Master, Monsteropolis is known as Megaland

Trivia

 * The name Monsteropolis might be inspired by Metropolis (both the film from 1927 and the manga by Osamu Tezuka).
 * For the Air Man song that the band "The Megas" composed, its name includes the word Monsteropolis.