Last stage of the game. Going after Dr. Wily himself.
Nothing too overly hard about this level. You do pick up a power-up that recharges all your sub-weapons & health, so that's super.
Then you have to fight the 4 remaining Robot Masters: Bombman, Fireman, Iceman & Gutsman (in that order). Just try to stick with the methods you used before and you shouldn't have any trouble. Shouldn't being the key word here.
Now for the demented doctor
Boss: Dr. Wily (2 Forms)
Weakness: Fire Storm (1st Form), Rolling Cutter (2nd Form)
Pattern: This first form moves back and forth, while shooting pellets at you in an arcing pattern. Use Fire Storm to make quick work of him (if you get close enough, use Fire Storm's fire shield to do even more damage). His second form, he moves back and forth, but shoots a large spiraling orb at you. The spirals will be semi-aimed at you, so you will need to jump. Use Rolling Cutter to multi-hit him (1 Cutter can hit him 2-3 times per shot).
At this time, IndieGamerRetro has 42,236 views for Mega Man spread across 10 videos. Mega Man has approximately 1 hour of watchable video on his channel, making up less than 0.15% of the total overall content on IndieGamerRetro's YouTube channel.