Level 20; The Final Battle can be tricky to master if you don't know how to deal with Ridley's attacks, but in my opinion, the only attack that is difficult to dodge without dodgeing or dashing is the big laser he shoots from his mouth. To deal with it, I'd run towards Ridley and turn into a Morph Ball as the laser comes near you. Also, items and hearts are allowed, so the Rapid Fire Helmet rocks.