After you obtain the Gravity Suit and kill Experiment No. Z-57, you make your way to Ghavoran.
Get an Item Sphere
From the Teleportal, go to the right and use the Grapple Beam to pull the Grapple Beam Block and destroy it, then roll through the tunnel where it was. In the next room, go to the door below the tunnel that you came out of, shoot it with your beam, then open it and go through.
In the next room, go to the left side and roll to the end of the tunnel. You will fall through a Pitfall Block. Go down below and shoot the item sphere in the statue's hands, then take the item to get the Screw Attack.
Screw Attack creates a destructive field around you whenever you Space Jump. It will quickly kill most enemies that you Space Jump through, and will destroy any Screw Attack Blocks that you touch. With this, you can reach almost every location on the planet.
Return to Burenia
Space Jump upward to Screw Attack through the upper left ceiling. Then go to the left and down, where you can use a Total Recharge Station if you wish. Go down from there, then to the left, and Space Jump upward to Screw Attack through the ceiling. Go to the right from there, then go through the door on the left. Go past the elevator and Screw Attack through the walls to reach a Missile Tank on the left. Then go back and use the elevator to go to Burenia.
Get a Missile+ Tank
Go to the left and Space Jump to where you see the Missile Tank. You will Screw Attack through the blocks beneath it. After you take it, go through the door on the left. You will get a briefing and can save the game. Then go through the door on the left, and go to the left until you can Space Jump upward. Screw Attack through the walls around the Missile+ Tank to get it.
Robot Chozo Soldiers
From the Missile+ Tank, Screw Attack upward until you can climb into the tunnel at the top. Go upward from there, then after you exit the tunnel, you will have to fight another two Robot Chozo Soldiers. Don't use Screw Attack on them, because you will take damage when you touch them. Instead, use Storm Missiles on them.
Get a Missile Tank
After they are defeated, go to the upper left of the room and reveal a Missile Tank by shooting a missile at the step to the right of the door. Take the Missile Tank, then shoot a charged shot at the door on the left and go through.
Return to Ghavoran
Go to the left and use the Teleportal to go to Ghavoran.
Get an Energy Part
Screw Attack up and to the left to break through the ceiling. Roll through the tunnel on the left, then when you reach the next room, go to the left and Screw Attack through the blocks above the water. After you open the Grapple Beam Door on the right, you can optionally Speed Boost through the door and Shinespark upward in the middle of the next room to reveal a tunnel that leads to an Energy Part. Otherwise, just go through the Grapple Beam Door. In the next room, go through the door at the bottom right of the room to reach a save room.
Get a Second Missile Tank
Leave the save room and Screw Attack upward through the room. You can optionally get the Missile Tank in the angled tunnel on the left side.
Go Through the Area
From the room to the left of the save room, Screw Attack to the top and go to the right. Kill the eyeball monster on the door and go through.
Slide into the tunnel on the right and go to the end. You will fall through some Pitfall Blocks.
In the room below, Screw Attack through the red creature to kill it. It will turn into a larger creature. Wait for it to go up on its hind legs, and Screw Attack into its chest, and avoid landing on the floor until after the electricity on the floor has dissipated. Repeat this until it dies.
The creature will transform into Golzuna. Throughout the battle, hold R so you can lock onto the glowing purple spot on its underside, and press Y when you can, to hit it. When Golzuna glows, back away from it to the corner of the room, because it will charge forward, then when it goes up on its hind legs, slide under it while holding R so you lock onto the glowing spot on its belly. Then press Y when you are safely able to, to hit it with Storm Missiles.
When Golzuna glows white, it will create one or more glowing dots. If Golzuna causes a single white dot to follow you, make sure that you are diagonal to it when it stops, because it will create a horizontal and vertical explosion. When it creates four floating dots that form a rectangle, Screw Attack in the middle to avoid the horizontal and vertical explosions that come out of them. When it creates four floating dots that form a diagonal line, Screw Attack above the boss and Flash Shift to the other side so that the boss will block the explosions.
Eventually, Golzuna will turn into a floating Core X. Use charged shots, missiles, or storm missiles on it until it dies. Take the X parasite that it leaves behind, and you will gain the Cross Bomb ability. To use it, hold R, then press Y to place a Cross Bomb. (You can still place regular bombs by not holding R when you press Y.) The blast from a Cross Bomb will move you farther than the blast from a regular bomb, which can allow you to reach places that were inaccessible before.
Get a Third Missile Tank
Go through the door on the right. Slide into the tunnel on the right and hold R and press Y to place a Cross Bomb. It will destroy several Bomb Blocks on the right. Go to the right side of the tunnel and place another Cross Bomb to open a hole on the right. Go into the tunnel on the right and place another Cross Bomb to reveal a Missile Tank. Take it.
Go to Hanubia
Go into (but not all the way through) the tunnel on the left (if you roll through it or you will fall through some Pitfall Blocks). Place a Cross Bomb and roll slightly to the left of it to be launched past the Pitfall Blocks. If you don't get far enough, go back into the tunnel and try placing the Cross Bomb farther to the left.
Above that, go into (but not all the way through) the tunnel above and place a Cross Bomb just inside of the tunnel to reveal the Pitfall Blocks on the right. Then use a Cross Bomb to launch yourself past the Pitfall Blocks. At the far right side of the uppermost tunnel, place another Cross Bomb to open a path above you and be launched upward. Then Screw Attack upward to break through the Screw Attack Blocks there, then roll through the tunnel on the right.
You will reach a shuttle area. Get into the shuttle to go to Hanubia.