Mega Man is a 1994 game developed by Freestyle and published by U.S. Gold, released only in North America for Sega's Game Gear handheld. Despite the title, it is not a port of the original Mega Man for the NES; instead, it uses elements from Mega Man 4 and 5 for the NES.
Mega Man is an action and platform game in the tradition of other Mega Man games. It is based on elements from the Nintendo Entertainment System versions of Mega Man 4 and Mega Man 5. Differences include a lack of continues (if the game is over, it restarts to the title), the addition of vertical scrolling, powerups bouncing when they hit the ground, and a hard difficulty mode (though the player has to get at least a password from this mode, since both difficulties don't share the same passwords).
The Robot Masters featured at the beginning are Bright Man, Napalm Man, Star Man, and Stone Man. Dr. Cossack's fortress contains Wave Man's and Toad Man's levels and respective bosses. Wily's fortress is actually Quick Man's stage from Mega Man 2, though the player is taken to a condensed Dr. Wily stage after going through the first boss door instead. The ending features Dr. Cossack's fortress being destroyed.