Darkwing Duck

He is the terror that flaps in the night! He is the irritating guarded enemy placed right after a boss rush! He is Darkwing Duck!

Basically, a shorter Mega Man game with a shield added that wasn't released in Capcom's home territory of Japan.

Unused Graphic
This smiley face is used as a placeholder in the sewer tileset. A similar graphic appears in Mega Man 3.

Unused Music
Only the first 26 seconds of the ending theme play before the track is cut off, leaving the other 26 seconds unused.