Doom

Various Codes
Pause the game and then enter these codes:
Effect
Code
All Weapons and Ammo
X, Triangle, L1, Up, Down, R2, Left, Left
Invincibility
Down, Left, Square, R1, Right, L1, Left, Circle
Map All
Triangle, Traingle, L2, R2, L2, R2, Right, Square
Map All plus Objects
Triangle, Triangle, L2, R2, L2, R2, Right, Circle
Level Warp
Right, Left, R2, R1, Triangle, L1, Circle, X
X-Ray Vision
L1, R2, L2, R2, Right, Triangle X, Right
Level Passwords
Level
Password
2
CR!3WDD3DB
3
3JJCMK8W64
4
03LTJ0Y!02
5
H33!1HFTHK
6
04MSKZX9Z1
7
YTTCLXXLXV
8
09SMBY04YW
9
7KKBLD7V53
10
FM421GSGJ
11
J!!3WDGLDB
12
07QPDW26WY
13
WTXQ9C3W12
14
RBR4G!LDLN
15
WTXQ9C2W11
16
548C7DFWYX
17
JOC89DZPQS
18
JGB9CT0NRT
19
9QLTKR0!02
20
78M63QX921
21
S!61FHVQJG
22
33QHFTT6WY
23
VBGQPJ!Y46
24
ZYKTLW7V53
25
0JSM4HW64
26
LS5YPTCRKH
27
ZDJSMVRW64
28
1YKTX4QV53
29
XKF6R8LZ97
30
DJX07Q4HTR
31
C0W1!QNJQS
32
VM!3V1D3DB
33
W394W2DMFC
34
ZQ58ZKJRKH
35
Z758ZKJ8KH
36
5C2V3DQBNL
37
NCKBLX7V53
38
1Q580FCRKH
39
HTMSKZZ9Z1
40
WS58ZKCRKH
41
CSNRG2W820
42
WT670JBQJG
43
DQLTJ1Y!02
44
2N94VFFMFC
45
CQLTJ0Y!02
46
WR492GDSGJ
54
7L3!266DJK
Bonus Levels
Level
Password
55
3P67ZNBQJG
56
JCGDNFL555
5 7
JCGDNFL556


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 Double Dragon

Secret Characters
At the character select screen, put the cursor on Billy, wait 3 seconds, move it to Marian, wait 3 seconds, move it to Chung Fu, wait 3 seconds, move it to Jimmy, wait 3 seconds. Then you have Shuko and Duke.