Here's the list of the Vault Combos and the corresponding first letter or digit of the password. Passwords are given after completing each treasure room. You will need to put in this vault combo in order to enter the last room of the game.
You can read more on the passwords here https://www.gamefaqs.com/nes/587296-gauntlet/faqs/31193
*The vault combo for the "A" password works but the continue password doesn't work. If you game over, you can't continue. And for some stupid (lazy) reason the game still gives them out.
*A code: 00000 *PYMKFERH B code: 00001 RXLIEFPG C code: 00010 N1KMHGOF D code: 00011 OZILGHNE E code: 00100 LTROBAMD F code: 00101 MSPNABLC G code: 00110 IWORDCKB H code: 00111 KUNPCDIA I code: 01000 G7DBONHR K code: 01001 H6CANOGP L code: 01010 E9BDRPFO M code: 01011 F8ACPREN N code: 01100 C3HFKIDM O code: 01101 D2GEIKCL P code: 01110 A5FHMLBK R code: 01111 B4EGLMAI S code: 10000 8F53YX91 T code: 10001 9E42XY8Z U code: 10010 6H351Z7Y W code: 10011 7G24Z16X X code: 10100 4B97TS5W Y code: 10101 5A86ST4U Z code: 10110 2D79WU3T 1 code: 10111 3C68UW2S 2 code: 11000 ZOWT7619 3 code: 11001 1NUS67Z8 4 code: 11010 XRTW98Y7 5 code: 11011 YPSU89X6 6 code: 11100 UK1Y32W5 7 code: 11101 WIZX23U4 8 code: 11110 SMY154T3 9 code: 11111 TLXZ45S2
Some useful passwords the practice near the end of the game. ELF. RM 79. LAU-22T-877 (typical inventory and HP) ELF RM 79. S4B-CMM-OPP (fully loaded inventory and HP)