Doom

ITEM/LEVEL			PASSWORD

Deimos Lab			pk04tmkstr

Refinery			h3bwgbdldb

A very difficult level		v8hfn54356

Club DOOM extra level code	JCGDNSL556

Invincibility			PAUSE GAME, DOWN, L2, SQUARE, R1, RIGHT, L1, LEFT, CIRCLE

All weapons and ammo		PAUSE GAME, X, TRIANGLE, L1, UP, DOWN, R2, LEFT, LEFT

All maps plus objects		PAUSE GAME, X, TRIANGLE, TRIANGLE, L2, R2, L2, R2, RIGHT, CIRCLE

Free stuff			PAUSE GAME, X, TRIANGLE, L1, UP, DOWN, R2, LEFT, LEFT

Level warp (unverified)		PAUSE GAME, RIGHT, LEFT, R2, R1, TRIANGLE, L1, CIRCLE, X

X-ray vision			PAUSE GAME, L1, R2, L2, R1, RIGHT, TRIANGLE, X, RIGHT

Transparent code		L1, R2, L2, R1, RIGHT, TRIANGLE, X, RIGHT


Multiple level passwords:

At enter password screen, hit X to select B, but keep holding it. Move the cursor to the right 
one space at a time and it should look like this: BCCDDFFGGH. By moving one space at a time, in 
different directions, you can find many passwords. For example, club doom is down right down 
right down right. If you die on a level and you had collected a few weapons previously, rather 
than restarting a level by pressing a key after you die, press START then SELECT to get to the 
option screen, goto PASSWORD and press X twice. This will restart your level with all prevoius 
weapons and health.
If you can make it all the way to level 30 without dying, you will get to play ping pong with 
one of the doom creatures.