All Working Metroid Fusion Cheats - GBA
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Wall jump
To reach platforms easier, spin jump next to a wall, press the D-Pad opposite to the direction that you went, then jump. Samus will touch the wall and propel herself off it in a another jump. This can be done repeatedly. Once you have the space jump, this is unnecessary.
Fire over ledge while hanging
You can fire over the ledge that you are hanging on by charging the Beam and releasing it. Note: This may only be done with the Wide Beam.
Speed boost warp
Once you have defeated Serris, find a place to run. Keeping going until you get your speed boost, then press [Down], [A] and choose the direction you wish to move. Samus will warp at very high speed, destroying anything in her path until she strikes a solid object that is not made of speed booster blocks.
Hyper Screw attack
This move is used while performing the Speed Booster. Note: You will also need the Screw Attack. While running in hyper mode, jump forward into a Screw attack and do not stop moving forward. You will notice that you will still be in hyper mode while airborne. If you continue the Screw attack with the Space Jump and never stop moving, you will remain in hyper mode until you run into something solid or stop moving. This technique is very useful for breaking boost blocks with no extra running space around them.
Defeating Arachnus
Fire a missile when it takes form (its stomach). It will now do one of two things. If it throws a blue slash at you, jump over it and fire another missile. If it spits fire at you, jump up and grab the small ledge. Press the D-Pad in the opposite direction and prepare to jump. Jump immediately before he hits the wall. Repeat this until Arachnus is defeated.
When the first set of fire comes down, turn into your Morph Ball and go all the way over to the fire ball on the right. Wait until it starts to go to the middle. Then, keep shooting missiles (when the spider is charging up) until it shoots the three fire balls. You will get hurt, but at least you will hit him. You have to keep going next to the fire balls until he loses his legs. Once this happens, you can go to the right of the stage and shoot missiles up at him. When he turns red, go to the left of the stage and shoot up.
To defeat the robo-spider easier, morph to ball form and stay in the corners. When its about to fire, shoot it with a Charge Beam or a few missiles. Then, run to the other corner and repeat until its legs fall off and it starts to spin.
Defeating Nightmare
When you get to the room with organism Nightmare, wait for it to fully appear. When it does, it will shoot a group of missiles/lasers at you. It goes up and down inside the room. When it is up, run underneath and shoot a missile at it. Shoot at the circle thing under it. Repeat this process until it only starts to shoot two lasers. You must then use the Charge Beam. Shoot at the same spot as you did with the missiles. Kept repeating this process. When it starts to explode, avoid the lasers. When its face falls off, jump onto the ladder on the wall and shoot missiles at it. When it reaches the wall, it will fly around. This is hard to avoid, but try to do so. Repeat this process until it turns into the ball. You should then know how to kill it. You will get the Gravity Suit ability. Note: You should have at least six energy bars.
Defeating Omega Metroid
This trick is easy to do and with some luck, you will not get hit at all in the entire battle. When the Sa-X sacrifices itself, get the Ice Beam. Then, when you start shooting the Boss in the chest, rapidly press [B] to keep hitting it. The Omega Metroid should cry in pain several times and will not be able to hit you.
In the battle with the Omega Metroid, when it swipes you, Samus will become motionless for a few seconds. However, if you rapidly press [Up], you will cut this time down dramatically.
Defeating SA-X
When you first get into the room where you fight SA-X, charge your Power Beam and go up to the door. Stay with ground combat. Since it is charged, keep it like that and wait until he is normal (and not a green ball and invulnerable). Take the first shot, then hold it down to charge again. He should jump into the air and land next to you. This is your chance to shoot. Do the same thing repeatedly until he gets fuzzy. When you hit him he will turn into a giant monster. The only way he can hurt you is to jump on you. Charge up your beam and hit him in the face four times. His eyes will go red. Walk next to him and he will die. On the spikeball, charge up your missiles, When his eye opens up, shoot then jump over him immediately. If you run low on health, use your Screw Attack and hit him. A group of Xs will appear. Collect as many as needed. You can do this repeatedly.
When SA-X enters, freeze him with an ice missile and charge up your beam. Continue this to defeat Sa-X in about two minutes.
Charge up your beam and spin jump to get him to follow you. While in the air, jump to reach the bottom. When he jumps, shoot your beam at him. Then do it all again until he transforms. Next, stand on the middle platforms and shoot him with a charged beam, then jump to the other side and do it again. When he changes again, treat it like the wide core-X. This requires practice.
When SA-X appears, charge up your beam and jump to the bottom floor. He will soon follow. Then, quickly jump up to the top right platform. If done correctly, he will jump on the platform. Immediately jump to the bottom floor and shoot at him when he comes down. Repeat this process several times until he turns into his monster form. The only way he can attack you is by jumping on you. You must charge up your beam and shoot him four times, including dodging his jumps. He will then turn into a large Core-X. Charge up your missiles to full then shoot his eye when it opens. When he takes damage, jump over him before he shoots you. Repeat this process a few times. If you run low on health, jump into him with your Screw Attack and he should release some.
Go into the room and make him appear. Then, just fall down onto the little ledge above the first door. When he tires to jump up by you, keep blasting him with your charged weapon. Then on the X, just use your charged Ice Missiles to kill it when its eye opens.
After you have defeated the SA-X, he turns into the monster thing. Instead of staying on the ground to fight him, go back to the top left door to the operations deck. Then, just charge your beam, jump up, and shoot it straight down at him. If you stay up there, it is impossible for him to hurt you. When you see him stop jumping, you must go back to the floor to kill the wide core-x/spiky thing.
To defeat the SA-X, you only have to get into a safe and predictable pattern. First, stay on the bottom floor. Second, do a high Screw Attack over him while charging your beam. He will do a double jump and land. Immediately after that, he will be open for an attack. Fire, then the SA-X will turn into a monster. Charge your beam, shoot, and the SA-X will jump. Quickly move from where you are. Repeat and he will be defeated easily.
Defeating Tube Parasite
You cannot hurt it at the moment, so prepare. Charge your beam up. The Boss will jump around. Hold the charge. Wait for the jump where a disk will appear below it. Run under it and shoot the charged beam at the disk. Then immediately afterwards, fire a missile after it. Next, run to the side with the most room. if the disk touches you, you will be sucked inside and damaged. When the head is left with the feet, the first jump will bring out the disk.
Collecting all X easier
Once you have the Power Bomb, go to a room where there are a lot of X Creatures/Parasites. Press [Down]x2 to morph into your ball form, then lay a Power Bomb. Do not move away from the bomb. When it explodes, not only will it destroy all onscreen enemies (unless the enemy is very powerful) and stun all the X parasites that appear, but the vacuum will pull all onscreen X parasites back to you. This can be done as many times as needed, depending on the amount of Power Bombs you have.
Increase health
When you have to do the last objective with the wind machines, gather X Parities to get a lot of life.
Invincibility
Charge up Charge Beam (if available), and do a Spin Jump.
Skipping levels
After you go through the restricted section, go to the navigation room just beside the elevator. When you talk to it, it will instruct you to go to another place. If you want to skip a couple levels, talk to it again. It will instruct you to go to the Operation room to set a collision course with a planet. You will now be able to go there.
Gamecube
Near the start of the game when the X are tying to make the environment to their own conditions and block the fans, go to one blocking the fans (the ones that you have to kill with missiles and give off X Parasites). It will be floating around. Look at the top left of it, in the very corner of the X. You will see a Gamecube.
Complete Sector 3 the first time. Once up on the elevator, an intermission will start, and the Navigation screen will read "Incoming Dispatch" with a GameCube at the bottom of it.
Hard difficulty setting (Japanese version)
Successfully complete the game under the normal difficulty setting to unlock the Hard Mode option.
Glitch: Stuck in wall
In the battle against Ridley, you can get stuck in the wall. To do this, get grabbed by Ridley but only make him let go when your flashing body is in the wall (the left one). You will now be stuck and can hit him without taking damage. Once he is gone, you can walk out. This may take several attempts. Note: You cannot stay in the wall while fitting the Core-X as it will knock you out of the wall if you cannot walk out. Also, your missiles will hit the wall and stop, but if he is close they will still hit Ridley; however your charge beam will go through the wall.