Manta shield:
Hold A + B + Up for two seconds of protection.

Map mode:
Pause game play and press A, C(2), B, A(2), B, Up. Use the D-pad to move through the current level. Press A to resume game play at any point in the level.

Level select:
Pause game play and press A, B, C, A, B, A, C, Left.

Bright pause screen:
Pause game play and press A(4), B(4).

Configuration menu:
Pause game play and press A, C(2), A, B, A, B, Left.

Debug mode:
Pause game play and press A, B, C(2), B, A, B(2).

Extra life:
Pause game play and press A, B, C(3), A(2), B.

One time extra life:
Pause game play and press A, B, C(3), A(3).

Energy refill:
Pause game play and press A, B, C, A, B, C, A(2).

One time energy refill:
Pause game play and press A, B, C, A, B, C, A, B.

Ammunition refill:
Pause game play and press C, B(2), A, C, B, A(2).

One time ammunition refill:
Pause game play and press C, B(2), A, C, B(2), A.

Money worm:
Pause game play and press C, A, B, A, B, A, C, A.

One time money worm:
Pause game play and press C, A, C, A, C, A, C, A.

Continue:
Pause game play and press A(2), C(2), B, A, Left, Right.

One time continue:
Pause game play and press A(2), C(2), B, A, Left(2).

Invulnerability toggle:
Pause game play and press A(4), Left, Right(2), Left.

Level codes:
Pause game play and enter one of the following controller actions to jump to the corresponding level.

Level	Code
Puppies One	Press C(6), A(2).
Puppies Two	Press Left, Right, B, C(2), Left, Right, A.
Puppies Three	Press Right(2), A, B, C, Left, Right, A.
Peter Pan	Press C, B, C, Left, Right, Left, A, B.
Abduction	Press Down, A, C, Left, Right, Down, A, C.
Inflated Head	Press B(2), C, A, B, C, Left, Right.
Sally	Press A, B, C(2), Up, C, Left, Right.
Soil	Press A(2), C(2), B(2), A(2).
Meat	Press C(2), Down(2), A, Right(2), Left.
ISO	Press A, B, C, Right(5).
Run Jim Run	Press B(2), C, Left(4), Right.
Unzip	Press C, A, C, A, B, A(2), Up.

Weapon codes:
Pause game play and enter one of the following controller actions to obtain the corresponding weapon.

Weapon	Code
Plasma Gun	Press C(4), A(3), B.
3 Shot Gun	Press C(4), A(3), C.
Homing Gun	Press C(4), A(2), B, A.
Bubble Gun	Press C(4), A(2), B(2).
Nuke Gun	Press C(4), A(2), B, C.
Teleport Mucus Bomb	Press C, A, B, C, A, B, Up, Down.

Hint: No cows:
Warp to the level where Jim is a Blind Cave Salamander. Then warp to the ending sequence. If done correctly there should not be cows inside the Princess, Psy-crow, or Earthworm Jim.