Play as Samus (No Suit) with Bonus Weapons
Enter JUSTIN BAILEY as a password. (You need to fill the remaining characters in the password with dashes.)

Alternate Game
Enter 999999 999999 KKKKKK KKKKKK as a password with no Varia suit and a different ending.

Super Jump
Hold Right on controller two and press A on controller one.

Quit Game Play
Press Start to pause game play. Hold Up + A on controller two to display the current password.

Progress Passwords

Status                           Password  
Slightly Powered in Brinstar     007ltp W20000 025kHa 8A00?Y  

Ridley                           00U--- -u0000 0AFw9Y 1800sb  

Ready for Kraid                  0Gz--- -m3e0G 00VvjS 3m00n?  

Tourian                          M7---- --zOA0 2T-tfm a000d5 atop  

In Suit, End of Game             uVt-Fg boo-W7 9t?lM0 O00Gsi  

No Suit-End of Game-Best Ending  X----- --N?WO dV-Gm9 W01GMI

Play as No Suit with All the 
Arsenal Weapons                  mMuiS1 II6-GE Jls?h0 m00WRM

Weird Code; Freeze, Varia,
No Bombs, Odd Ending             Daniel Daniel Daniel Daniel

Second Quest                     022400 A00000 05?00m 0000aS

Second Quest as Samus
Without Suit                     0WX002 W00004 1VW0C0 0000MO