Pause the game and enter:

A + B, C, C, A, A, B, B, B + C

Pause the game and enter:

B, B, A, C, A + B, A + B, A + B, A + B

Pause and press:

A + C, A + C, A + C, A, B, C, B, A

Pause the game and press:

A + B, A + B, C, A, Right, Right, Left, Right

Pause the game and press:

A + B, C, C, C, A, B, B, B

Pause and enter the following:

A + Up, B, A, C, A, A, C, B

Pause the game and press:

A + C, B, B, C, C, C, A, B

Pause the game and enter:

A + C, A, B, B, C, A, C, C

Pause the game and enter:

A, A, A, A, A, A, B, C

Pause the game and press:

C, A, A, A, A, B, C

Pause the game and press:

B, B, A, A, A, A, B, C

Pause the game and press:

Down + C, B, A, A, A, A, B, C

Any time during the game, pause it and press A and Left, B, B, A and Right, B, B, A. Unpause the game, and the words 'Cheater!' will appear on the screen. Up comes a menu which lets you select your level, give yourself infinite energy and check the map of any level.

Begin your game, take controller one and press START to pause at any point, Now press A, B, B, A, A+C, B+C, B+C, A+C. You'll skip to the next level.

Press START to pause then enter one of the following codes:

Plasma Shot Weapon: C, A, B, C, A, B, A, C
Earn one continue: A, B+Left, A, B, A, B, C, A
Fill weapon to 1,000 rounds: A, B, B, B, C, A, C, C
One free guy: B, B, C, C, A, A, A, A

At any time, pause the game and press C and Down simultaneously, then press A, B, C, A, B, A, C. You will hear Earthworm Jim say ''Cheater! Plasma!.'' Now when you unpause the game, you will have nine plasma shots. You can do this as much as you want.

At any time, pause the game and press B and Up simultaneously, then press B, A, C, A, A, A, A. You will hear Earthworm Jim say ''Cheater! Wheee Doggy!.'' When you unpause the game, you will see that you now have an extra life. You can perform this code as many times as you want.

Buttville pasword on the Difficult setting.

Redball, Cow, Atom, Atom, Cow

Pause the game and enter A,C,C,A,B,B,A,C.

When playing the first level, pause the game and press Left, Right, A, B, C, Left, Right, A.

Pause the game, and press A+C, A+B, C, C, B, B, A, A. You will hear Earthworm Jim yell ''Cheater'' and you will be brought to the ending scene of the game.

Pause game play and press A + C, A + C, A + C, A, B, C, B, A.

Pause game play and press A + C, A, B, C, B, C, A, C(2).

Pause game play and press A + C, B(2), C(3), A, B.

Pause game play and press Right + A, A(2), B, A, C, B, A.

Pause game play and press C + Up, A(2), C, A, B, C(2).

Pause game play and enter one of the following codes to start game play at the corresponding level.

Level Password
What the Heck? Press A, Right, A, C(2), Left, Right, A.
Snowman Press Right(3), A, C, Left, Right, B.
Evil the Cat Press Up, Down, Right, C(2), Left, Right, B.
Big Bruty Press C(3), Left(3), Right(2).
Down the Tubes Press Up, Down, Left(2), Up(3), Down.
Tube Race Press Up(2), Left(2), Down, Left, Up, C.
Snot a Problem Press C, B, C, Right(2), Left, A, B.
Snot a Problem 2 Press Up, B, C, Down(3), A, C.
Snot a Problem 3 Press A, Up, C, Up(2), Down, C, A.
Lab Press A, B(2), Down, Right(2), Left, Right.
Chicken Plummets Press A, B, C, Up, Down(3), Right.
Naked and Lovin' It Press C, A, C, Left, Right, Up, Down, Right.
For Pete's Sake Press A, B, C, A, B, A, Down, Right.
Andy Asteroids Press A, Left, A, C(3), B(2).
Andy Asteroids 2 Press C, Down, A(2), Down, B(2), Down.
Andy Asteroids 3 Press A, Down, Left, A, C(2), A, B.
Andy Asteroids 4 Press A, Down, A(2), C(2), A, B.
Andy Asteroids 5 Press A, Left, A, C(2), Down, Up, A.
Andy Asteroids 6 Press A, Right, A(2), Right, B, Up, A.
Intestinal Distress Press C(2), A, Right, Left, Right, B(2).
Who Turned Out the Lights Press A + C, B, Up, Left, Right(2), Left(2).
Who Turned Out the Lights 2 Press A, B, Up, B, Left, Right, C, Up.
Who Turned Out the Lights 3 Press A, B, C, Up, Left, A, Right(2).
Who Turned Out the Lights 4 Press A, C, Up, Left, C, Right, Left, B.
Who Turned Out the Lights 5 Press C, B, Up, Down, Left, Right(2), Left.
Queen of Buttville Press A, C, Left, Right, B, Left(2).
Buttville Helicopter Press B(2), Down(2), A, Right(2), Down.
Psycrow Press C, B, Up, Down(2), Right, Down, Right.

Press pause and then press:

Pause the game before entering these codes:

This is a very simple code, but it's kind of funny. When you are at the Buttville stage where you must use the helicopter head to fly downwards: There are two different paths to take in order to complete the stage. Take the left one, but don't leave yet, just stand on the ground near the exit. Now, run into the thorns until Jims health reaches from 20% to 30%. Now when you get hit this time- the second you get hit, run to the exit where you get warped to the next stage and Jim won't be dead yet. You'll appear in the next stage,now quickly run as soon as the stage begins, and it looks like Jim has a heart attack or something because he dies for no reason- this is most likely because the game couldn't calculate the damage taken by the thorns fast enough to make Jim die in the previous stage.