Super Metroid/Maridia

To Maridia
Now, you need to go to the section of Brinstar with the glass tube leading to Norfair to get to Maridia. From Samus' ship, you can take the right path to get there quicker. On the other hand, you can take the left path to get some items in Brinstar on the way to Maridia.

Optional Items In Brinstar Before Maridia
Return to the left area, and head down to Brinstar, backtracking to the area where the second Missile Tank was found. Head right, stopping before the obstruction leading to where the Tank was. Drop a Power Bomb to clear it, giving space to run. Aim at the upper left part of the wall to show a hidden Energy Tank, then get run from the right and jump and grab it.

Now, observe the black spot in the obstruction that was just removed. You can Speed Boost from the left, then Shinespark through this spot to reach a secret area. Take the door. Over the pool with spikes, there is a hidden bridge revealed with the X-Ray Scope. Jump atop it, moving left, looking out for falling boulders. The next room holds a Missile Tank in plain sight. Next, bomb the left part of the platform holding the pedestal and pipe to get another Missile Tank. Return to the initial room, bombing to get through the part you Shinesparked from.

Keep heading left, back to the part where the Morph Ball was found. Keep Power Bombing the left wall and moving left, until you get back to the green section of Brinstar. Then, head back to where the Chozo Statue was with the Charge Beam, in the room left of here. You'll have to bomb the two side-by-side blocks again to get there. Down here, use a Power Bomb. The right side of the pipe under the Statue will open, where you can roll to a red door. In the next room, kill the Zeros in the path, then go back right and get a Speed Boost left. You'll get rid of the obstructions and enemies, leading to Brinstar's last item: an Energy Tank.

Now, return right, this time taking the lower path.

Breaking the Glass Tube in Brinstar
However you got here, you should be in the glass tube room left of the elevator room to Norfair. Lay a Power Bomb in the tube. As soon as you try to move afterward, the glass will shatter, and you'll be in the water. You could have done this earlier, but it would have been inconvenient to get to either side of the tube without the Gravity Suit, and getting to Maridia would pretty much be impossible. You can start by heading down to get to the red door leading to a Save Station. Then, you can take the upper path with the door in the ceiling to actually reach the aquatic Maridia.

Maridia Proper
There is a Missile Tank to get here by Shinesparking, though it may be difficult. If you want it, start by going right, through the red door. Get rid of the Scisers roaming about, and activate the green shutter. Start by shooting the left door to open it, then go right. Speed Boost back left, ducking to store it, then head back to the left room. Shinespark up as soon as you get to the left plant which is closest to the foreground. If done correctly, you'll jump between the upper platforms, where you'll go through part of the ceiling to get a Missile Tank.

Now then, head up and left in the initial Maridia room. You may notice a Super Missile Tank, but it cannot be gotten now. Take the upper right door.

To progress, you must use the single grapple points to get right. If you want items, however, instead drop straight down. After the metal section, head right on the green part before a cliff. Short jump right, to reach the high ground after the pit. You may notice a Sciser walking into a hidden passage on the left cliff. To get there yourself, jump left and morphball on the way down, and hold left while falling. From here, keep moving left to get to the last room, where you can get a Super Missile Tank. Now head back right.

Back here, keep going right, then take the rightmost door on the floor. Pink Space Pirates are in this room, though there is currently no easy way of defeating them, so avoiding them is best for now. Go left, down the third gap. At the bottom, there is a hidden passage to the right through the wall that you can get through by jumping into the side. At the end is a door to go through.

Move right, and you'll see the turtle-esque Tatori and its children. If you attack the little ones, the Tatori will spin left and right which will damage you greatly. While its active, jump on top of it, where it'll fly up to a grapple point. You can spin 180 degrees on this point, then land to get an Energy Tank. After, there is a Missile Tank to be found by shooting the middle of the right wall. You can jump on the Tatori while it's near the right to get it, or you can try to Walljump for it.

Now, return left, then up, back to the room with the grapple points. From the top left, use the points to reach the top right. The round Powamp enemies here can be grappled to if you fall. Wait until they reach their highest point before trying to swing back up, and try not to touch them as they can do damage. Take the top right door.

Here, the bottom part leads to progress, but you can head through the top ceiling door to get some items.

The top door leads to a room with sand and grass. Spiked Owtch enemies pop up from the ground every so often in nearby rooms, so watch where you step. A quick Super Missile can end them if they're troublesome. Go right carefully, and after the Owtch continue right through the wall to get a Missile Tank. Then go back left, taking the left upper door.

Just keep moving left, through the hidden passages. In addition to Owtches, there are flying Menu enemies, which are like the earlier Mellas, but might be quicker to home in on you. You want to go through the upper left door.

Keep left, and drop down the large pit with a Chute. Under the Chute is a secret area which you can drop down to reach a Missile Tank as well as a  Super Missile Tank. Return to the room composed of metal with a lone Sciser. Shoot the middle of the floor, where you can drop down and move right to a green door.

Another Section of Maridia: To Draygon
You should now be in an area made up of metal and bricks, with different music to suggest a new area of Maridia. There are Yard enemies here, which are shelled creatures similar to crabs. If you face them, they'll remain in their shell. If you look away, though, they will approach. If you attack them, they'll bounce around and respond by quickly moving toward you. So, it may be best to avoid trying to harm them, as touching their shells does no damage. You can knock them around by running, and they should bounce far enough away to not be too much of a problem.

From the start, use a Power Bomb to get below. You can take the lower red door to a Save Station. Speed Boost to the right past the walls with grapple points, and before the end there is a gap without points. Shinespark up this gap to reach a Missile Tank. After it, head right a bit and use the X-Ray Scope to spot hidden crumbling blocks. Jump over them to get to a Super Missile Tank. You can fall down the crumbling blocks now. Walljump, Shinespark, or grapple to get to the upper left section. Then, take a door in the ceiling.

In this room, you will spot Metroid-like Mochtroids trapped by shootable walls, with Speed Boost blocks nearby. Unlike the more powerful Metroids, basic attacks are enough to take out these creatures. Shoot the walls and Mochtroids until enough of the path is clear at the bottom that you are able to Speed Boost. Dash right to activate it, allowing you to get to the right door. Ensure you're ready, because a miniboss is inside.

Maridia's Miniboss: Botwoon
In this room you should notice four holes in the wall. The snakelike miniboss Botwoon can freely move between these holes. When Botwoon appears, aim for its head with Missiles, Super Missiles, or charged shots to damage it. Charged shots and Super Missiles do the same amount of damage. Thus, it is probably ideal to rely on Super Missiles to defeat Botwoon, since they are both the fastest and most damaging option.

Botwoon's main method of attack is swimming around after exiting a hole, trying to hit you. To avoid this, merely remain near the left corner, firing at its head when you get a chance. Sometimes, only the head of the miniboss will be visible from the wall. Botwoon will then spit a wave of green orbs from its mouth. This gives you a good opportunity to hit the enemy's head, but the attack can be also hard to avoid considering the number of orbs heading toward you. So if you see Botwoon's stationary head, be prepared to move from the corner to dodge it. If the attack seems too close for comfort, try morphballing to make yourself a smaller target. Botwoon will redden and speed up upon taking damage. Eventually, Botwoon may forego the spitting attack and instead merely move around at high speeds. This means the battle is close to ending, so aim carefully to defeat the miniboss. Upon Botwoon's destruction, the right wall will explode, allowing you to get to a blue door on the other side.