Debug mode:
Enter the password WOLF, then press RS + LS + P while playing the game. The following things may be done under debug mode: play and change pitch of all sounds; display frame rate based on CPU activity; and force the flag to appear in the first building that is destroyed.

Invincibility:
This code works in one and two player modes and must be done separately for each vehicle. Choose a vehicle from the vehicle select screen. Press C to display the fuel/ammunition screen. Hold RS + LS + B + C, then press X to bring up the exit menu. While the "Do Not Exit" icon is highlighted and all the buttons except C are pressed, press Down + A. A "double" vehicle select sound will confirm the code.

Unlimited vehicles:
This code must be done separately for each vehicle and must be repeated if a new map is started. Choose a vehicle from the vehicle select screen. Press C to display the fuel/ammunition screen. Hold LS + RS + A + C. While the buttons are held, press Down. A sound will confirm code entry. Then, press Right. Three light blue shadows of the selected vehicle will appear.

Lock all levels:
Enter the password ZZZZ to remove access from all previously completed levels.

Unlock all levels:
Enter the password WOLF to allow access to all levels.

Opening sequence:
Enter the password TITL to play the opening sequence.

Removing the control window:
Select a vehicle from the bunker. Press P immediately as ramp begins to rise with the vehicle. Then, press P to resume the game at the pause screen.

Self-destruct:
Press A + B + C to self-destruct. It can be used as a quick way to return to the bunker.

Zoom out:
Press A + B and to zoom out the view by about 25%. This only works when the camera is fully zoomed in.