Hold L + R and press Down, X, Up, Y, Down(2), Up(2) at the main menu. Release L + R 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.

God mode:
Enter 8wonder as a code.

Level select:
Enter KKst0ry as a code. Note: 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. Note: This code includes the number "1" in the second
word.

Machine gun:
Enter KKcapone as a code.

Revolver:
Enter KKtigun as a code.

Shotgun:
Enter KKsh0tgun as a code. Note: This code includes the number "0".

Sniper rifle:
Enter KKsn1per as a code. Note: This code includes the number "1".