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.
11/21/2002
Hard Mode
Beat Metroid Prime to unlock Hard Mode. In this mode, enemies attacks are more powerful than normal.
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.
Start with Suitless Samus, 5 Missiles, All Upgrades, No Energy Tanks
000000 00000G 7?2ruA 005WFh
Suitless Samus at Start.
000000 000020 000000 000020
Fight Ridley
00U--- -u0000 0AFw9Y 1800sb
Start at Tourian, all powerups, suitless Samus, ready for the best ending
0iF - - - - - - w - q 3ax - 50 0000wx
Start at Tourian,all powerups , ready for the best ending
5X - - - - - - - N?W OdVue0 0000iu
Start at Tourian,all powerups , ready for the 5th ending
7 - - - - - - zVw1Y T - YW01 - W5WCl
Hard Mode
999999 999999 KKKKKK KKKKKK
Debug Mode
BOMBS_MISSLE SCREW_ATACK
Starts you in the beginning with armorless Samus and no powerups. Can enter Tourian from the start.
CONTIN UE_MY_ GAMEMI NIBOSS
Begin in Nofair, Mother Brain killed, Maru Mari, Varia, 212 missiles
ITs-JU ST-YOU ZIPO-- ----Ci
Begin the game with all power ups and Samus will not be wearing her suit.
JUSTIN BAILEY ______ ______
Suitless Samus and all Weapons
mMuiS1 II6-GE Jls?h0 m00WRM
Begin the game with infinite life, infinite ammo and all upgrades.
NARPAS SWORD0 0000__ ______
Invincibility and Infinite Missiles, plus Ridley dead
NARPAS SWORD0 000000 086073
Invincibility and Infinite Missiles, plus Ridley & Kraid dead
NARPAS SWORD0 000003 037251
Start at Tourian,all powerups , ready for the 4th ending
OV - - - - - - r - e6 9t?A08 000GTq
Start at Tourian, all powerups, ready for the 2nd ending
V - - - - - - r - e69 t?A00e 00M04p
Start at Tourian,all powerups, ready for the 3rd ending
X - - - - - - - N?WO dVue08 001GL2
Best Ending
X----- --N?WO dV-Gm9 W01GMI
215 missiles, 5 energy tanks, all powerups, both mini-bosses dead
X-z-uJ lls0W0 fVvweG 000WNr
10/18/2004
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!
1/4/2005
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.
1/4/2005
Easy Meta Ridley kill
During Ridley's second phase, use the Wavebuster. With enough Missiles, he dies in one hit.
1/21/2005
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.
2/22/2005
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.
4/10/2005
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.
6/28/2006
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.