Final Doom cheats

Weapons, ammunition, and keys:Pause game play and press X, Triangle, L1, Up, Down, R2, Left(2). All weapons, ammunition for them, and keys for current level will be available.

Extra ammunition:Pause game play and press X, Triangle, L1, Up/Right, Down, R2, Left(2). All weapons, ammunition for them, and keys for current level will be available.

Map all lines:Pause game play and press Triangle(2), L2, R2, L2, R2, R1, Square. All walls and boundaries will appear on the map for the current stage.

Map all objects:Pause game play and press Triangle(2), L2, R2, L2, R2, R1, Circle. All objects including enemies, items, weapons, and secret switches will appear on the map.

Map of entire level:Pause game play and press Triangle(2), L2, Square + Up, R1, Right, L1, Left, Circle.

Invincibility:Pause game play and press Down, L2, Square, R1, Right, L1, Left, Circle.

Level select:Pause game play and press Right, Left, R2, R1, Triangle, L1, Circle, X.

Transparent walls:Pause game play and press L1, R2, L2, R1, Right, Triangle, X, Right. Your character may now see through one layer of wall or sprites.
 

Level	Name	Password
The Master Levels
2	Virgil	RBF9D395SQ
3	Canyon	1L3C!F7XO2
4	Combine	HLLZTPOKKK
5	Catwalk	6J1NWHFR64
6	Fistula	8WWRSSHM79
7	Geyron	D9SOWVFJFC
8	Minos	HS9YW3HMFC
9	Nessus	OSSHCWFVYW
10	Paradox	HT!OVLXLDB
11	Subspace	J77VYTMDCF
12	Subterra	6XDHRW25!8
13	Vesperas	C33W2YOGHK
TNT Evilution
14	System Control	FP62ZMSWJG
15	Human Barbecue	D5510QKRKH
16	Wormhole	ZVBKT!O69!
17	Crater	1CCTV9GQ!9
18	Nukage Processing	TM4OLJ2ZKJ
19	Deepest Reaches	HYY4GQ9GSQ
20	Processing Area	!5NR4W7C20
21	Lunar Mining Project	1FFGVZ1777
22	Quarry	SN5YORKIGH
23	Ballistyx	ZBBST6R89!
24	Heck	GK25JLV3LL
The Plutonia Experiment
25	Congo	G224SGYSNL
26	Aztec	TR8WXJVNBD
27	Ghost town	XBBRT67N8!
28	Baron's Lair	NGZ9HTCMMP
29	The Death Domain	OGGMO6W546
30	Onslaught	99SD40FYVW

Hint: Enemies:

Former Soldiers: They resemble your old friends, but now they just fire pistols at you. They drop clips for the chaingun and pistol when killed.

Former Sergeants: Meaner and tougher. They carry shotguns and do more damage then soldiers. They drop shotguns when killed.

Imp: This creature throws fireballs and takes more bullets to kill.

Demon: Appear in most areas and can rip your head off if you are not careful. If you see more of them, use the chaingun.

Cacodemon: These creatures are ugly and have one big mouth. If they see you, they will fire lightning balls from their mouth. Use your rockets.

Mancubus: You have to use more then a chaingun to kill them. Use ammo with caution.

Arachnotron: Fires plasma energy at you. Use your rifle.

Spider Demon: The ultimate enemy. Has a super chaingun mounted on her body. Use your plasma rifle or rocket launcher.

Glitch: Pain Elemental:When you kill the Pain Elemental (the yellowish monster that flies and shoots Lost Souls at you), it should explode to release many Lost Souls as it does in Doom and Doom 2, but it does not.