List of Metroid passwords

The only game to feature codes is the original Metroid.

Codes

 * NARPAS SWORD0 000000 000000: Granted full invincibilty, all upgrades, and a cool sprite for the Ice Beam
 * JUSTIN BAILEY -- --: You will spawn in Norfair with the Wave Beam, all upgrades, no armor, all missiles (255) and all Energy Tanks but only 30 units of health.
 * M7 --zOA0 2T-tfm a000d5: You will spawn in Tourian will 239 missiles, 30 units of energy (but will all available energy tanks), and all upgrades. You are also suited.
 * X- --N?WO dV-Gm9 W01GMI: You will spawn in Tourian with 250 missiles, 30 units of energy (but will all available energy tanks), and all upgrades. This code is for those who want to view the best ending of the game as this is the code for the best ending.
 * 333333 333333 KKKKKK KKKKKK: Odd code. As soon as you input the code, you are directed back to the title screen. For those who pressed continue but want to go back to the title screen to select new game.
 * CONTIN UE_MY_ GAMEMI NIBOSS: You spawn in Brinstar with suitless Samus, about 200 missiles, 30 units of health (with 3 available tanks), and all upgrades excluding the Long Beam, Morph Ball Bombs, Screw Attack, and Varia Suit. With this code, it is not necessary that you go and defeat Kraid or Ridley; the gateway to Tourian is open.