Sega's Genesis

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Earthworm Jim

Cheat Mode:

At any point, pause the game and press (A+L), B, B, A, (A+R), B, B, and A then un-pause.

Extra Continue:

At any point, pause the game and press A, (L+B), A, B, A, B, C, and A.

First Extra Man:

At any point, pause the game and press (U+B), B, A, C, A, A, A, and A.

Second Extra Man:

At any point, pause the game and press B, B, C, C, A, A, A, and A (can only be done once per level).

Power-Up:

At any point, pause the game and press A, B, B, B, C, A, C, and C.

9 Plasma Guns:

At any point, pause the game and press (D+C), A, B, C, A, B, A, and C.

Full Health:

At any point, pause the game and press A, C, C, A, B, B, A, and C.

Warp to "What The Heck":

At any point, pause the game and press L, R, A, B, C, L, R, and A.

Ecco The Dolphin

Debug Menu:

Pause the game with Ecco facing you, and press R, B, C, B, C, D, C, and U.

Invincibility with New Game:

Start a new game and after Ecco swims to the right and the screen fades out, press and hold (A+START). The game will begin paused. Un-pause and play.

Invincibility with Continued Game:

Enter a password to select a level, then as the name for the level appears, press and hold (A+START). The game will begin paused. Un-pause the play.

Passwords:

          FRNAINCG - Undercaves           DCHEINCN - The Vents
          BKUQBMJR - The Lagoon           COSPLYMS - Ridge Water
          DVYAMYMS - Open Ocean           GMWQHSLO - Ice Zone
          KQRFHSLG - Hard Water           XMQIOYMF - Cold Water
          RECMLYME - Island Zone          LNOTLYMA - Deep Water
          ATMXNYMZ - Marble Sea           VDGBOYMD - The Library
          COSPLYMS - Deep City            TQAFOYMM - City of Forever
          ENMMJKMU - Jurassic Beach       UXFQJKMR - Pteranadon Pond
          GHZTJKMK - Origin Beach         RLSXJKMK - Trilobite Circle
          SFMBKKMQ - Dark Water           LBBAKNLV - Deep Water (2nd)
          JSFTVLMR - City of Forever(2nd)  no-code - In the Beginning (2nd)
          QZETWQNL - The Tube             SCBXOFNY - Welcome to the Machine
          DKPWBAIH - The Last Fight

Ecco 2: The Tides of Time

Debug Menu:

Pause the game with Ecco facing you, and press A, B, C, B, C, A, C, A, and B.

Passwords:

                  |                 |   Password under
          Level # | Level Title     | Default  |   Hard
          --------+-----------------+----------+----------
              1   | Home Bay        |   N/A    |   N/A
              2   | Crystal Springs | MKUYFZEB | MOAXEAFB
              3   | Fault Zone      | EEFJPGZA | ICVTHJZA
              4   | Two Tides       | CVDTVAZA | QGFPDAZA
              5   | Skyway          | QUDKOMDB | YEMFLPDB
              6   | Sky Tides       | MGKATNDB | QYMCLPDB
              7   | Tube of Medusa  | MGOADEZA | AWVUHJZA
              8   | Aqua Tubeway    |   N/A    | YAWZHJZA
              9   | Skylands        | AYQVHXEB | CDUNDAFB
             10   | Fin to Feather  | EUXFCYXA | QSZGOYXA
             11   | Eagle's         | ODTSWODB | UEFJLPDB
             12   | Asterite's Cave | SLIDTVXA | SNZLOYXA
             13   | Maze of Stone   |   N/A    | ASJVKPXA
             14   | Four Islands    | AGPDSFBD | EEPLGGDB
             15   | Sea of Darkness | IMEKDNXA | YWJYKPXA
             16   | Vents of Medusa | WVSYVXYA | OLFUDAZA
             17   | Gateway         | SDOJWXEB | IOTSDAFB
             18   | Sea of Green    |   N/A    |   N/A
             19   | Moray Abyss     | UWUXHWXA | KHAIPYXA
             20   | Sea of Birds    | ECSEVXYA | WHRIHBZA
             21   | The Eye         | UAHBJYQE | MGGMVBRE
             22   | Big Water       | UALLOOGA | MGKWASGA
             23   | Deep Ridge      | WMFSCSOD | OSEXOVOD
             24   | The Hungry Ones | QYMPUWJE | YCRVOFJE
             25   | Secret Cave     | UKSFQNPE | MQRHCRPE
             26   | Lunar Bay       | YOPVQNPE | QUOXCRPE
             27   | Black Clouds    | IMYWMHLE | ASXAYKLE
             28   | Gravitorbox     | WXJHUWJE | ODJTGAKE
             29   | Globe Holder    | ODNJUWJE | GJMRGAKE
             30   | Dark Sea        | IVSRBWDA | QTBRPWAA
             31   | New Machine     |   N/A    | CEWXDYHA
             32   | Vortex Queen    | WOWTKBDA | KICHPWAA
             33   | Home Bay (2nd)  |   N/A    |   N/A
             34   | Epilogue        | GIPZZGBA | YBQETFBA
             35   | Atlantis        | EPODJZHA | ITHUPBIA
             36   | Fish City       | OQTKGDFA | CYQFJSBA
             37   | City of Forever | WYFTOXKA | EPWXFJHA

El Viento

Stage Skip:

At any point, pause the game and press U, L, R, D and B to skip to the next stage.

Complete Magic:

At any point, pause the game and press U, L, R, D, and C. This will give you one magic each time you do it. Repeat five times to get all of the magic powers.

Slow Motion:

At any point, pause the game and press U, L, R, D, and A to put the game into slow motion mode.

E-Swat

Level Select:

When you game over, while "THE END" is on the screen, hold (A+B+C+D+L) and press START. Hold until the music repeats to get to a level select screen.

Evander Holyfield "Real Deal" Boxing

Secret Green Boxer:

Use the name "THE BEAST" when creating your boxer and you will get a green boxer with full power instead of the regular one.

Ex-Mutants

Cheat Menu:

At the "Options" screen, set "Music" to 05, "Sound FX" to 21 then highlight "Exit". Next, hold START then press (A+B+C). You'll hear a voice say "Too easy!". Now, move to the "Cheater Cheater Mode" menu (the game will start immediately after you chose an option within this menu).