Final Doom PlayStation 1 Cheats

Codes
Invincable = down, L2, Square, R1, Right, L1, left, Circle.
All Weapons = x, triangle, l1, Up, Down, R2,<,<. Master Level Codes
Mission --- Password
2 --- 610QNNFT35
3 --- F!R251P1FD
4 --- RBB4M6HRST
5 --- QWC5CS83QS
6 --- NJJ64RFRPM
7 --- N1J74MYSPR
8 --- 811TMQ8W64
9 --- 7KKNL7D443
10 --- 28RFDDS5YX
11 --- C66YZLSGGG
12 --- GR85XJVNBD
13 --- C33V2DHGHK

Level 2 Codes
Mission --- Password
2 --- 7GGLPXL746
3 --- YGZLPX2!56
4 --- XHHSNYB965
5 --- 75NK!VGZZO
6 --- C2253RNRML
7 --- NT!3JRNDCB
8 --- 8LLT8KRV02

Level 3 Codes
Mission --- Password
10 --- !6PQGGJVOZ
11 --- WHHTNNPS65
12 --- O1JQYV3N3
13 --- 5MMD72GFZ1
14 --- HK25JRDQNL
15 --- S772MKWKCF
16 --- 78RB35L1VX
17 --- J226DG5PNL

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

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

Weapons, Ammunition, and keys
Pause the game and press: X, Triangle, L1, Up, Down, Left, Left(twice). Now all weapons, ammunition for them, and keys for the current level will be available.

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

Transparent Walls
Pause the game and press: L1, R2, L2, R1, Right, Triangle, X, Right. Now your character may see through one layer of wall or sprites.