How to Get to the Boss in Maridia

Head up from the smashed pipe to reach a blue door. Go to the top of the next room and go through the door on the right.

Grapple all the way across the next room's roof and through the blue door to the right. Shoot the floor, drop down, and run right to a green door. Power bomb the floor, run left and save, then head right. Wall jump up the first shaft to reach a blue door.

Run right through a room filled with collapsing platforms. When you reach a dead end, head all the way left and speed boost through the wall. Head through the door to fight the area's miniboss, Botwoon.

Defeat Botwoon by avoiding its body and firing missiles at its head. When it emerges partway from a hole in the wall to spit acid at you, score massive damage by firing a super missile at its head.

Head right and speed boost through the next room. Wall jump through the Metroid-filled shaft and go through the blue door on the right. Make your way through the next room, using wall jumps to stay near the ceiling, so as to access the save and recharge rooms at the upper right.

Jump through the false spikes in the next room to reach a boss door. Wait until the eye on the door opens, then shoot it with missiles to reach Draygon, the boss of Maridia.