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1. Preface
1.1. Introduction
1.2. Controls
1.3. Special Moves
1.4. Game Physics and Structure
2. Walkthrough
2.1. Story
2.2. Part 1: "The Investigation" 1, 2, 3, 4, 5, 6, 7
2.3. Part 2: "Old Friends" 1, 2
2.4. Part 3: "The Showdown" 1, 2, 3, 4, 5
2.5. Cleanup 1, 2, 3
2.6. Ending(s)
3. Archives
3.1. Powerups 1, 2
3.2. Easter Egg
3.3. 1% Challenge
3.4. Speed Runs (with and without 100%)
3.5. Bosses 1, 2
3.6. FAQ
3.7. Version History
3.8. Legal Stuff

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Metroid Fusion FAQ/Walkthrough

By: Phediuk

2. Walkthrough

2.2. Part 1: "The Investigation" (1)

After watching the intro, which is quite similar to the second section of story from the inscruction booklet, you'll be given your first mission...

"The Explosion"
STORYLINE: There's been an explosion in the Quarantine Bay...Samus must investigate. What could have caused it? We shall soon see...

Once you gain control of Samus, press Start to look at your map. See the Navigation room just up ahead? Follow the completely linear and completely safe path there. Adam will inform you that bio-signs have been confirmed in the bay...

Go out the left door of the Navigation room. Go up the vertical shaft into the top left door, then drop down the next shaft into the bottom left door. Voila, we're in the Quarantine Bay. Kill the lone enemy in here with your gun (it'll take three shots.) Grab the X parasite that appears upon the creature's death, then backtrack to the Navigation room. Adam will give you some bad news: all of the specimens in the Quarantine Bay were X parasites, it turns out. The X take the appearance of their victim, so the researchers were easily fooled. Luckily, Samus has the ability to absorb X parasites. Yellow ones restore health, green ones restore Missiles, and red ones restore both. Remember that.

Anyway, go out the left door. Go up the vertical shaft, shoot the grey hatch (that's how you open 'em) and go through to the right. Continue on to the right and you'll end up at a Save Room. Save if you want. Now, go out to the right, up the shaft, and through the top right door. You'll enter a Navigation room. Adam will relay a message that the Federation sent: they can support you with downloadable weapons. However, you must reach a Data Room in order to get these weapons. Adam will send you to get the Missiles from the nearest Data Room.

Now, go out the right door, up the shaft, and through the top right door. Step on the elevator and press Up to use it. During the ride, Samus will talk to herself. Cool! Now, go out the right door, and you'll be in the Operations Deck. The bottom left door leads to Recharge and Save Rooms, and the middle left door leads to Navigation and Data Rooms. Save if you want. Now continue to the Data Room. Step on the switch to download. Samus will now acquire ten ***MISSILES***. Go back into the Navigation room. Adam will say that the power's been knocked out...meh. Looks like we can't use that elevator to get to the target. We'll have to find another way.

Go out of here and jump over to the rightmost platform in the big room. Blast the panel on the right wall with a Missile (hold R and press B) and it will explode. Jump over to it and you'll find that it's a secret passage. Awright! In the next shaft, blast the green pillar with three Missiles. It'll explode. Step on the cracked floor behind it and you'll drop down. See the cracked wall to the left? Blast it with a regular shot and it'll crumble away. Drop down and kill the gooey scientist guy if you want, then step on the cracked floor and tumble right on down. Go to the left, step on the cracked floor again. You'll drop down AGAIN (kinda repetitive, ain't it?) Anyway, jump against the rungs on the right wall and you'll grab on. Climb up 'em. Drop down the next two shafts and you'll stumble across a ***MISSILE TANK***. Grab it, obviously (1/48, 15.) Go through the bottom left passage. In here. Shoot the top block on the upper ledge and it will reveal another ***MISSILE TANK*** (2/48, 20.) Now go back out and to the right. In here, go up the shaft and into the top right door to save, then go to the bottom left. You'll come across your first Boss Door. If the eye is yellow, it's invulnerable and the yellow 'stuff' will shoot out at you. If the eye is brown, blast it with a Missile. After three Missiles, the Boss Door will be destroyed. Go through.

In this room, the music will change. You'll need to use the metal hangings to navigate around here. Grab onto a hanging, press in the opposite direction and jump to scale them. After two shafts, you'll stumble across your first ***ENERGY TANK*** (1/20.) Next, shoot a few Missiles up at the ceiling and some blocks will break away. Climb up and go through the passage to the right to grab another ***ENERGY TANK*** (2/20.) Now just drop down the pit in the room to the left to engage our first boss...


Arachnus is a large creature that vaguely resembles a beetle. To win against him, be as aggressive as possible. As soon as he appears, get right in his face and empty your Missiles into him. He will use one of two attacks before he dies:

1. He will use the Morph Ball and roll across the room. Easily jumped.
2. He will shoot blue waves at you. These cause minimal damage, so you can ignore them and keep shooting Arachnus.

Once his HP reaches rock bottom, he'll attack more and leave behind a trail of fire with the Morph Ball attack. You can see the attack coming a mile away, though, so there's not much worrying about it. If you somehow come close to dying during this battle, grab onto the hangings on either side and blast Arachnus from there (hold L and press Down.)

If you happen to run out of Missiles before he dies (which is likely), you'll have to slowly chip away at him with your peashooter. Eventually, he'll die and a Core-X will appear. If you have no Missiles for the Core-X, fire your beam at it to make it cough up some X, then grab the green ones to restock. Three missiles will break the shell of the Core-X, at which point you can grab the ***MORPH BALL*** it leaves behind.


Now, morph into a ball (double-tap Down) and roll out of this hellhole. =D

Continue on to the left until you reach a wall with a ledge on it. Grab it and press Up while hanging to roll up into a ball. Narrow passages are no obstacle! Into the room on the left!

Continue through this room until you reach an odd-looking wall in front of a grapple wall. See those cracked blocks in it? Two blasts from your beam will clear them away. Now, head to the left (making sure not to hit the various enemies hiding out in the dark) and you'll end up one room from a Save Room. Go and save, yo! After you're done, go down and to the left into the Navigation room. Adam will inform you that the worst possible scenario has happened: the X have invaded other parts of the station. Looks like our efforts were for naught...he'll send you over to Sector 1 and try to clean out the X for good.

Now, you can continue on to the Main Elevator, but in the vertical shaft outside the Navigation room, roll into the narrow passage to pick up a ***MISSILE TANK*** (3/48, 25.) Now, roll into the narrow passage just inside the next room and go down the Main Elevator once you reach it.


...What...the...all of a sudden, someone or something that greatly resembles Samus will walk in (with quite an explosive entrance) and proceed to blow up the elevator shaft. Ouch. But, what IS that thing? Eh, let's not worry about it for, just go to the left one room and down the elevator.

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