Level Passwords...
	Link-up with 1 Disk...
	Map all items...
	Map all lines...
	More Codes...
	Random levels...
	Soundtrack...

Enter the following codes at the Password screen.

Password	Effect
CR!3WDD3DB	Level 02
3JJCMK8W64	Level 03
03LTJ0Y!02	Level 04
H33!1HFTHK	Level 05
04MSKZX9Z1	Level 06
YTTLCXXLXV	Level 07
09SMBY04YW	Level 08
7KKBLD7V53	Level 09
FM4217GSGJ	Level 10
H!!3WDGLDB	Level 11
07QPDW26WY	Level 12
WTXQ9C3W12	Level 13
RBR4G!LDLN	Level 14
WTXQ9C3W11	Level 15
548C7DFWYX	Level 16
JOC89DZPQS	Level 17
JGB9CT0NRT	Level 18
9QLTKR0!02	Level 19
78M63QX921	Level 20
S!61FHVQJG	Level 21
33QHFTT6WY	Level 22
VBGQPJ!Y46	Level 23
ZYKTLW7V53	Level 24
0DJSM4HW64	Level 25
LS5YPTCRKH	Level 26
ZDJSMVRW64	Level 27
1YKTX4QV53	Level 28
XKF6R8LZ97	Level 29
DJX07Q4HTR	Level 30
C0W1!QNJQS	Level 31
VM!3V1D3DB	Level 32
W394W2DMFC	Level 33
ZQ58ZKJRKH	Level 34
Z758ZKJ8KH	Level 35
5C2V3DQBNL	Level 36
NCKBLX7V53	Level 37
1Q580FCRKH	Level 38
HTMSKZZ9Z1	Level 39
WS58ZKCRKH	Level 40
CSNRG2W820	Level 41
WT670JbQGJ	Level 42- The Factory
DQLTJ1Y!02	Level 43- THe Inmost Dens
2N94VFFMFC	Level 44- The Suburbs
CQLTJOY!02	Level 45- Tenements
WR492GDSGJ	Level 46- The Courtyard
PFFGXH3777	Level 47- The CItadel
JWCJV2X479	Level 48- Nirvana
CJJTM35964	Level 49- The Catacombs
M!T174XZXV	Level 50- Barrels of Fun
5770MX2CDF	Level 51- Bloodfalls
YJLW3PPCPM	Level 52- The Abondoned Mines
DKKBLM58J3	Level 53- Monster Condo
7L3!266DJK	Level 54- Redemption Denied
4680Q7B5BD	Level 55- Fortress of Mystery
T3QP7W26WY	Level 56- The Military Base
RNSM5YYMYW	Level 57- The Marshes
HWKB!57V53	Level 58- The Mansion
644YL1Q9GJ	Level 59 - Club Doom

It is possible to play link-up Doom using only one copy of the game. It's a bit ropey but it does work and I think the main reason for that is that I am doing the swap method on one PSX (ie I have a Japanese and UK Playstation, a PAL copy of the game). Anyway, load up Doom on one of them, choose all the options and then start the linkup. It'll say "waiting for connection". Now wait a second or two, take out the CD and pop it in the other PSX and load it up. Set up the same options, and then start the linkup. It'll say "waiting for connection" then after a while it'll change to "loading" as will the other one. After another while it'll probably just stop. Wait until you can't hear the CD making any more noise than just the sound of inactive spinning and take it out and put it in the first PSX. Now wait a while and it should load up and work. With mine when a level is completed it'll then crash. I think it may be because of the linkup but I don't know. Anyway, it's good while it lasts!

Pause game play and press Triangle(2), L2, R2, L2, R2, R1, Circle. To confirm correct code entry, a message will appear on the bottom of the viewing window and will disappear the game is resumed. All objects including enemies, items, weapons, and secret switches will appear on the map as blue triangles.

Pause game play and press Triangle(2), L2, R2, L2, R2, R1, Square. To confirm correct code entry, a message will appear on the bottom of the viewing window and will disappear the game is resumed. All walls and boundaries will appear on the map for the current stage.

Note: To do the codes you have to pause the game then push these buttons

Invincibility: Down, L2, Square, R1, Right, L1, Left, Circle
All Weapons: X, Triangle, L1, Up, Down, R2, Left, Left
X-Ray Vision: L1, R2, L2, R1, Right, Triangle, X, Right
Complete Map of Stage: Triangle, Triangle, L2, R2, L2, R2, R1, Square
Items On Map: Triangle, Triangle, L2, R2, L2, R2, R1, Circle
Level Warp: Right, Left, R2, R1, Triangle, L1, Circle, X

Enter DOOMMNLxxx or H3LL1SHxxx, where xxx the same character such as !!! or 666, at the password screen. The game will start at a random level with an unusual amount of ammunition, armor, and life.

Play track two of the game disc in an audio CD player to hear music from the game.