Glitches

Space Jump Boots Early: PAL and NAPC
Unlike the NTSC version of this glitch, you cannot execute a dash jump via Scan Visor. Instead, head to the Temple Access (the room visible when you are finished saving on your ship). Lock on to the first Seedling and back up. Without letting your lock on reticule pass the door connecting the Landing Site with Temple Access, head back to your ship and carefully position yourself on the rear right thruster on the ship. Now, execute a dash jump (dash right, off of the ship, and let go of L when the dash is executed) and continue to the Alcove. Your Space Jump Boots await you!

Suicidal Wall Metroids
First, get a metroid latched onto you. Next, lay a bomb and position yourself next to a wall, so that when the metroid is dislodged, it gets stuck in the wall. Wait a couple seconds, and the metroid should simply explode. This is particularly useful against the Fission Metroids, especially when low on Power bombs.

Frozen Omega Pirate without a Stasis Chamber
When you enter the Omega Pirate's stasis chamber room for the boss fight(It's for getting the Phazon Suit) switch to your Scan Visor. Now lock onto the Omega pirate and walk to his left, start scanning him and walk toward him until a Cinema screen appears. When the movie screen appears press start to skip this little movie. You should see him without the stasis chamber around him. This gives you the Chance to Blow off one of his Shoulder/Knee pads before he even wakes up.

Unlockables

Unlock Art Galleries

Multiple Endings and Bonuses

Hard Mode

Secrets

Unlock Original NES Metroid/Metroid Fusion Suit
To unlock the original NES Metroid, simply beat Metroid Fusion on GBA, then link the GBA (with Fusion in it) to the GCN (with prime in it) then at the main menu of prime goto the bottom where it says GBA link bonuses or something like that. Make sure you have beaten Metroid Fusion though.

To unlock the Metroid Fusion Suit, do the exact same thing only dont beat fusion, but beat prime.

Easy Meta Ridley kill
During Ridley's second phase, use the Wavebuster. With enough Missiles, he dies in one hit.

Meta Ridley Quick Air Form
This trick makes Ridley much shorter. While in his air form, wait until he flies above you and crashes down on you. Before he flies back up, hit him with the boost ball. If done correctly, he will lose his wings and the ground form will begin.

Easy Metroid Prime (Core) battle
Near the point at which you start is something resembling a twig embedded into the ground. While standing on top of this twig, you are completely immune to Metroid Prime's shockwave, it's only (common) attack. The only things that can hurt you are the short range lunge attack and spawned Metroids, which fall easily anyway.

Curiously, while standing here, Metroid Prime will not change emission spectra without laying a pool of Phazon, which helps the fight along considerably.

Passwords

Classic Passwords
Once you beat Metroid Fusion for the GBA and link up to your Gamecube you can play classic Metroid. The following passwords are for the Classic Metroid game. Enter these by pressing Z at the main menu while your GBA and Gamecube are linked.

Easter Eggs

Bird Hunting on Tallon IV!
When you are in Chozo Ruins, look up. You will find many birds flying around, ready for the killing. Shoot at them, and you will see their feathers gently fall if you shoot them correctly.