Level select
Hold [L1]+ [L2] + [R1] + [R2] at the main menu, press [Triangle], [Up], [Triangle], [Circle], [Right], then immediately release [L1], [L2], [R1], and [R2] when the level select text appears.

Invincibility
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Circle], [Triangle]x2, [Circle], [Right], [Up], [Left], [L1], [Square].

Extra airstrike
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down], [Up], [Circle], [Down], [Up], [Down], [L1].

Bones air strike
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Triangle], [Right], [Circle], [Left]x2, [Circle], [Triangle]x2, [L1], [Right]. Note: This code may only be enabled during the last level of the game.

Seal
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Circle], [Triangle]x2, [L1], [Right]. Note: This code may only be enabled during the last level of the game.

Bones seal
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Triangle], [Right], [Circle], [Left]x2.

Earthworm Jim cow power-up
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Up], [Down]x2, [L1], [Right].

Strange mode
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Left], [Circle], [X].

Dummy decoy
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [X], [L1], [Right], [Circle], [X], [Up], [Square].

Super chain gun
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Left], [L1], [Down], [Square], [Triangle], [Up], [Down].

Grenade
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Triangle], [Circle], [Square], [L1], [Right].

Sniper grenade
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Up], [Square], [L1], [Left], [Circle], [Triangle].

Homing sniper grenade
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Left], [Up], [X], [Square], [L1], [R1], [Right].

Display coordinates
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down]x2, [Triangle]x2, [L1], [X], [Triangle].

Mortar
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Left], [L1], [Triangle], [Square], [Right], [Circle], [Left]x2.

World's smallest nuke
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down], [Up], [Square], [Triangle], [Down], [Circle]x2, [Right].

World's most interesting bomb
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down], [Right], [Circle]x2, [Left]x2, [Up], [Square], [Triangle].

Faster speed
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Right], [Circle], [Triangle], [Circle], [X]. Press [R2] during game play to activate faster speed.

Thumper weapon
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down], [Up], [Left]x2, [Triangle], [Up], [Right], [Down].

Twister weapon
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Down], [L1], [Square], [Triangle], [Right], [Up], [X].

No opponents
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Up], [Square], [L1], [Left], [L1], [Square]x2.

Super gun
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Right], [Up], [Down], [L1], [Down], [Circle], [Left]x2.

Homing bullets
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Square], [L1]x2, [Right].

150 hit points and extras
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Square], [Triangle], [L1]x2, [Left], [Square], [Triangle], [Circle], [Right], [L1].

Full hit points
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Right], [L1], [Square], [Triangle], [L1], [Down].

Nodie
Pause game play. Press [L1], [Up], [Square]. Resume game play and immediately pause the game again. Press [Circle], [Triangle]x2, [Circle], [Right], [Up], [Left], [L1], [Square].