What platforms is Mega Man on?

Mega Man is available on Sega Game Gear.

When did Mega Man release?

Mega Man was first released on December 31, 1995.

Mega Man

Dec 31, 1995PlatformSega Game Gear

Mega Man — frequently asked questions

What platforms is Mega Man on?: Mega Man is available on Sega Game Gear.
When did Mega Man release?: Mega Man was first released on December 31, 1995.

About Mega Man

It's MEGA MAN versus the powerful leaders and fighting forces of Monsteropolis - that strange multi-layered land of robot-like humanoids created by the wrongly-performed experiments with human beings by Dr. Wily. Mega Man - the chosen defender of the human race. For he dares to single-handedly penetrate Monsteropolis' seven separate societies to stop the rapid expansion of strange misrepresentations of humans. Mega Man's goal is monumental. He must infiltrate seven separate heavily-guarded empires. By himself, he must break down and destroy the following empire leaders: Cutman, Gutsman, Iceman, Bombman, Fireman, Elecman, and Dr. Wily. The action involves Mega Man armed only with laser beam weapons, encountering strangely-configured humanoids. They're atop, in and out of fortified prison-like structures strengthened with thick walls. Hidden amid gun turrets embedded in concrete uprights, even in subterranean passages below icefields. WOW!

Summary via IGDB.

Mega Man on Wikipedia

Mega Man is a 1987 platformer game developed and published by Capcom for the NES/Famicom. The first installment in the Mega Man franchise and the original video game series, Mega Man was produced by a small team specifically for the video game console market, a first for Capcom, which up until that point focused on arcade games. It was directed by Akira Kitamura, with Nobuyuki Matsushima as the lead programmer.

Source: Wikipedia (text under CC BY-SA 4.0).