Doom

God Mode from Hypersega
Pause the game and press DOWN,Y,X,R,RIGHT,L,LEFT,B

worp to any level from Hypersega
Right,Left,Z,R,Z,L,Z,C

full map from Hypersega
B,B,C,Left,B,B,C,Right

all items and enimies on map from Hypersega
B,B,C,Right,B,B,C,Left

all guns from Hypersega
B,Y,X,L,R,C,X,Z

Level Passwords from Christian Crawford

Level                    Health Armor Weapons   Password
2 - Plant                125%   200%  All      CR!3WDD3DB
3 - Toxin Refinery       200%   200%  All      3JJCMK8W64
4 - Command Control      200%   200%  All      03LTJ0Y!02
5 - Phobos Lab           200%   200%  All      H33!1HFTHK
6 - Central Processing   200%   200%  All      04MSKZX9Z1
7 - Computer Station     125%   200%  All      YTTLCXXLXV
8 - Phobos Anomaly       200%   200%  All      09SMBY04YW
9 - Diemos Anomaly       200%   200%  All      7KKBLD7V53
10 - Containment Area    100%   200%  All      FM4217GSGJ
11 - Refinery            200%   200%  All      H!!3WDGLDB
12 - Deimos Lab          200%   200%  All      07QPDW26WY
13 - Command Center      350%   150%  1234 6   WTXQ9C3W12
14 - Halls of the Damned 100%   200%  123456   RBR4G!LDLN
15 - Spawning Vats       300%   175%  123 6    WTXQ9C3W11
16 - Hell Gate           50%    75%   1234567  548C7DFWYX
17 - Hell Keep           100%   125%  1234567  JOC89DZPQS
18 - Pandemonium         100%   125%  1234567  JGB9CT0NRT
19 - House of Pain       100%   200%  All      9QLTKR0!02
20 - Unholy Cathedral    100%   200%  All      78M63QX921
21 - Mt. Erebus          200%   200%  All      S!61FHVQJG
22 - Limbo               200%   200%  All      33QHFTT6WY
23 - Tower of Babel      200%   200%  All      VBGQPJ!Y46
24 - Hell Beneath        200%   200%  All      ZYKTLW7V53
25 - Perfect Hatred      200%   200%  All      0DJSM4HW64
26 - Sever the Wicked    200%   200%  All      LS5YPTCRKH
27 - Unruly Evil         200%   200%  All      ZDJSMVRW64
28 - Unto the Cruel      200%   200%  All      1YKTX4QV53
29 - Twilight Descends   200%   200%  All      XKF6R8LZ97
30 - Threshold of Pain   200%   200%  All      DJX07Q4HTR
31 - Entryway            200%   200%  All      C0W1!QNJQS
32 - Underhalls          125%   200%  All      VM!3V1D3DB
33 - The Gauntlet        150%   200%  All      W394W2DMFC
34 - The Focus           150%   200%  All      ZQ58ZKJRKH
35 - The Waste Tunnels   175%   200%  All      Z758ZKJ8KH
36 - The Crusher         200%   200%  All      5C2V3DQBNL
37 - Dead Simple         200%   200%  All      NCKBLX7V53
38 - Tricks and Traps    200%   200%  All      1Q580FCRKH
39 - The Pit             100%   200%  All      HTMSKZZ9Z1
40 - Refueling Base      200%   200%  All      WS58ZKCRKH
41 - O of Destruction!   200%   200%  All      CSNRG2W820
42 - The Factory         200%   200%  All      WT670JBQJG
43 - The Inmost Dens     200%   200%  All      DQLTJ1Y!02
44 - The Suburbs         100%   200%  All      2N94VFFMFC
45 - Tenements           200%   200%  All      CQLTJ0Y!02
46 - The Courtyard       200%   200%  All      WR492GDSGJ
47 - The Citadel         200%   200%  All      PFFGXH3777
48 - Nirvana             200%   200%  All      JWCJV2X479
49 - The Catacombs       200%   200%  All      CJJTM35964
50 - Barrels of Fun      200%   200%  All      M!T174XZXV
51 - Bloodfalls          200%   200%  All      5770MX2CDF
52 - The Abandoned Mines 200%   200%  All      YJLW3PPCPM

Mid Level Options Screen from Matla
Pause the game, hold directional right and button A at the same time.

Secret Levels from JRobin
The Military Base: P7WTK!GF12
Fortress Of Mystery:1XY!PCKNTR
The Marches: NMLCJSGXZ1
The Mansion: YCW1!QQJQS
Club Doom: CKFGR93Z97

Game Shark Codes from Boogie Bear
Master Code....................f6000914 c305 b6002800 0000
BFG 9000.......................160893c0 0001
Plasma Rifle...................160893be 0001
Rocket launcher................160893ba 0001