At the main menu, hold L + R and press Down, X, Up, Y, Down(2), Up(2). 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 the corresponding cheat function. Note: The codes have no effect when playing as King Kong.

Level select
Enter "KKst0ry" as a code. Note: This code includes the number "0".

Invincibility
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.

One-hit kills
Enter "GrosBras" as a code.

Full ammunition
Enter "KK 999 mun" as a code.

Infinite spears
Enter "lance 1nf" as a code. Note: This code includes the number "1" in the second word. Press Reload to get the spears.

Get Revolver
Enter "KKtigun" as a code.

Get Shotgun
Enter "KKsh0tgun" as a code. Note: This code includes the number "0". Alternately, enter "KK BigBlast" as a code.

Get Machine Gun
Enter "KKcapone" as a code.

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

Bonuses completed
Enter "KKmuseum" as a code.