Here are some interesting cheats and passwords for PSX Doom. This is the game from the 90s that brought Doom to the Sony PlayStation.
Level passwords
Level 55: VZH96K4YMP
Level 56: 6LC!2FYTHK
Level 57: NM3BJ67SZI
Level 58: 8R!3WDDGDB
Level 59: WWYZ8SS2SQ
Containment Area: JCGDNFLFFF
PSX Doom cheats. To use, press START to pause, then enter the codes.
GOD Mode – down, l2, square, r1, right, l1, left, circle
All Weapons – cross, triangle, l1, up, down, r2, left, left
Level warp – right, left, r2, r1, triangle, l1, circle, cross
Map plus objects – triangle, triangle, l2, r2, l2, r2, r1, circle
X-Ray vision – l1, r2, l2, r1, right, triangle, cross, right
PSX Doom passwords. These bring you to the level with some Weapons and Ammo.
Secret levels. Level Passwords.
Level 55 – Fortress Of Mystery – VZH96K4MP
Level 56 – The Military Base – 6LC!2FYTHK
Level 57 – The Marshes – WVX07TT0TR
Level 58 – The Mansion – WCYZ8SSGSQ
Level 59 – Club Doom – WWYZ8SSZSQ
These level passwords are for PSX Doom.
There are passwords for PSX Final Doom also but the passwords for Levels 2 – 30 are interchangeable between Final Doom and the original PSX Doom.
Ultimate Doom.
Level 02 – Nuclear Plant – CR!3WDD3DB – LB173PPWPM
Level 03 – Toxin Refinery – 3JJCMK8W64
Level 04 – Command Control – 03LTJOY!02
Level 05 – Phobos Lab – H33!1HFTHK
Level 06 – Central Processing – 04MSKZX9Z1
Level 07 – Computer Station – YTTLCXXLXV
Level 08 – Phobos Anomaly – O9SMBYO4YW
Episode Two.
Level 09 – Deimos Anomaly – 7KKBLD7V53
Level 10 – Containment Area – FM4217GSGJ
Doom2 Hell on Earth.
Level 31 – Entryway – COW1!QNJQS
Level 32 – Underhalls – VM!3VD3DB
Level 33 – The Gantlet – W394W2DMFC
Level 34 – The Focus – ZQ58ZKJRKH
Level 35 – The Waste Tunnels – Z758ZKJ8KH
Level 36 – The Crusher – 5C2V3DQBNL
Level 37 – Dead Simple – NCKBLX7V53
Level 38 – Tricks And Traps – 1Q58OFCRKH
Level 39 – The Pit – HTMMSKZZ9Z1
Level 40 – Refueling Base – WS58ZKCRKH
PSX Doom Xploder codes
PAL2NTSC
$75B019B3CECE
$85B019B3CECD
$75AE708FCECE
$85AE708FCECD
Y-Fix
$75AD882BCEDD
$85AD882BCECD
$75AAF08FCEDD
$85AAF08FCECD
Infinite ammo
$B5ADBED3CECD
$15B346C7CE30
All weapons
$B5B0BED3CECD
$15B346A3CECE
All keys
$B5ACBED3CECD
$15B3466FCECE
Have rapid fire & map
$B5ABBE83CECD
$15B34667CECE
Night vision on
$85B3466BCECE
Invincible
$85B34657CECE
$85B3464FCE94
$85B3464BCE31
Apparently, enabling the Nightmare difficulty in Sega Saturn Doom is possible, this is explained here; https://segaxtreme.net/threads/action-replay-codes-for-nightmare-difficulty-in-saturn-doom.25268/. This would be interesting to make a YouTube video of. Even the SNES version of Doom had Nightmare mode. It was quite playable.