Hold L1 + R1 and press Down, Circle, Up, Square, Down(2), Up(2) at the main menu. Release L1 + R1 and a 'Cheat' option will appear at the main menu. Select the 'Cheat' option, then enter one of the following case-sensitive codes to activate the corresponding cheat function.

God Mode
Enter 8wonder as a code. You will still take damage, but will not lose a life. However, high falls and fire can still cause loss of life. Also, this code must be re-enabled with each new level.

Level Select
Enter KKst0ry as a code. This code includes the number '0'.

One-hit Kills
Enter GrosBras as a code.

999 Ammunition
Enter KK 999 mun as a code.

Bonuses Completed
Enter KKmuseum as a code.

Unlimited Spears
Enter lance 1nf as a code. This code includes the number '1' in the second word. Press Reload to get the spears.

Machine Gun
Enter KKcapone as a code.

Revolver
Enter KKtigun as a code.

Shotgun
Enter KKsh0tgun as a code. This code includes the number '0'.

Sniper Rifle
Enter KKsn1per as a code. This code includes the number '1'.