Part 1: Intro and Top Man

Comments:
Yeah, Slide is Down + A, which makes far more sense anyway. When I first played the game, incidentally, I was stuck at the mandatory slide part in Top Man because I couldn't figure out for the life of me how to get past .
Also...YouTube, why the fuck did you suddenly decide to accept my videos? I won't complain, but....

Music:

Title _{- I think it's absolutely beautiful, one of my all-time favourite 8-bit songs. The calm introduction seguing into the heroic main part...it's got so much going on, going to the borders of the system's limitations and then some.}

What if Mega Man 3...had lyrics? by brentalfloss

Stage Comments:
As I say, it's quite easy. The first part can get you swarmed easily, but there's plenty of health to refill on. The miniboss cats shouldn't be any trouble, and the platforming part at the end is very nice. If you're really doing badly, you can also farm Top Fiends for refills.

Boss Strategy:
Most of it should be visible in the video. He'll always shoot out three tops which home in on you, then spin for a bit in place and change sides. Repeat.
The tops are dodgeable with one slide at the right moment. If you're always far away from him, jumping over the Top Spin attack isn't a problem, though you might get caught off-guard by its surprising speed. Don't get hit too often, as it's quite damaging.

Enemies:

Mecha Kero: _{Those jumping buggers are actually among the hardest enemies in the game. They're impossible to hit with the P-Shooter when they're not jumping, and when they do, they do it fast. They'll always follow you, even up surprisingly high ledges and don't usually come alone. Best to practise shooting at the right height!
Thankfully, they're vulnerable to attacks that do hit them. I'll show those off.}

Neo Metall DX (normal): _{Still with the old shoot-three-pellet-pattern, but now after shooting, they'll charge you! Can catch you off-guard. Provides an easy opportunity to take them out, though, as they don't immediately close up again after shooting like other versions do.}

Nut&Bolt: _{A very strange enemy, as they don't have big eyes like the rest of them. Most of the time, they're more a nuisance than anything, forcing you to wait until fully assembled to become vulnerable; placed during difficult jumping sections, though, they get dangerous as you might not be able to shoot them down immediately after becoming vulnerable. Their following you then is a big threat; best taken down with weapons that shoot in other directions than forward.}

Picket Man Bull: _{Not a Met by name, but a variant of the picket-axe throwing guys from Guts Man's stage in the first game! They're quite easily dealt with due to not having too much health; relatively small hitbox, though. Sometimes placed dangerously, but not often so.}

Tama (Tabby): _{Shooting either two balls of yarn in succession (which have exactly the same health as the cat, so don't bother trying to destroy them) or three fleas, this miniboss is nothing to write home about. 10 shots are quickly dished out, and special weapons with more damage would make a mockery of it...if I didn't always take the only stage they're in first, of course.}

Top Fiend: _{Periodically shooting out an easily destroyable projectile doesn't equal danger in the slightest. The only one of those guys ever proving a problem is the one after the sliding section - a beautiful example of game design, if you ask me. You can farm them easily, but should never have to in the stages they're in.}

Music:

Top Man _{- Very energetic, full of action, damn fun to listen to. Strangely, though, I never can quite remember it. Not enough melody maybe.}

Boss Battle _{- Not my favourite. I think it hasn't got enough action to it to deliver on the cool intro part.}

Get a Weapon _{- Gameboy one is so far better .}

Stage Select _{- ...strangely catchy.}

Stage Start _{- Different from the first, second and fourth game! Strange that they changed it back, because it's a really great jingle.}