Special Passwords

Unlock All keys
Submit KNGHTSFR as your password.

Unlock All maps
Submit LMSPLLNG as your password.

Unlock All weapons
Submit THRBLDNS as your password.

Unlock Unlimited ammunition 
Submit NDCRSDRT as your password.

Unlock Unlimited health
Submit HLGNDSBR as your password.

Unlock Level skip
Submit NFTRWLLH as your password. If you go to the map screen and push Select you will advance to the next level.

Unlock Sound effects test 
Submit CRSDR as your password. Submit the game options menu, then set "Sound FX" to "Off", then back "On" to hear a random sound.

Unlock God mode
Submit S_X_N as your password. Note "_" indicates a space..

Regular Passwords

Unlock Cheat mode:
Submit NRYRDDS as your password. Remember that this mode disables all special passwords and only the passwords below can be used.

All keys: KEYS
All maps: MAPS
All weapons: WEAPONS
Unlimited ammunition: AMMO
Unlimited health: HEALTH
Level skip: SKIP
Disable cheat mode and enable "special password" codes: PWORD
Sound effects test: SFX TEST
God mode: ALL

These are the level advancing codes that can be entered once you are in the cheat mode.

Level 2, Easy Difficulty -  A
Level 3, Easy Difficulty -  B
Level 4, Easy Difficulty -  C
Level 5, Easy Difficulty -  D
Level 6, Easy Difficulty -  E
Level 7, Easy Difficulty -  F
Level 8, Easy Difficulty -  G
Level 9, Easy Difficulty -  H
Level 10, Easy Difficulty -  I
Level 11, Easy Difficulty -  J
Level 12, Easy Difficulty -  K
Level 13, Easy Difficulty -  L
Level 14, Easy Difficulty -  M
Level 15, Easy Difficulty -  N
See End Credits, Easy Difficulty -  O
Level 2, Medium Difficulty -  AA
Level 3, Medium Difficulty -  BB
Level 4, Medium Difficulty -  CC
Level 5, Medium Difficulty -  DD
Level 6, Medium Difficulty -  EE
Level 7, Medium Difficulty -  FF
Level 8, Medium Difficulty -  GG
Level 9, Medium Difficulty -  HH
Level 10, Medium Difficulty -  II
Level 11, Medium Difficulty -  JJ
Level 12, Medium Difficulty -  KK
Level 13, Medium Difficulty -  LL
Level 14, Medium Difficulty -  MM
Level 15, Medium Difficulty -  NN
See End Credits, Medium Difficulty -  OO
Level 2, Hard Difficulty -  AAA
Level 3, Hard Difficulty -  BBB
Level 4, Hard Difficulty -  CCC
Level 5, Hard Difficulty -  DDD
Level 6, Hard Difficulty -  EEE
Level 7, Hard Difficulty -  FFF
Level 8, Hard Difficulty -  GGG
Level 9, Hard Difficulty -  HHH
Level 10, Hard Difficulty -  III
Level 11, Hard Difficulty -  JJJ
Level 12, Hard Difficulty -  KKK
Level 13, Hard Difficulty -  LLL
Level 14, Hard Difficulty -  MMM
Level 15, Hard Difficulty -  NNN
See End Credits, Hard Mode`OOO