Return Fire

Enter the WOLF password to begin a game. Then, anytime during gameplay, hold down Buttons L and R and pause the game. A debug menu will appear that enables you to have the flag in the first building and to play sounds from the game.

After entering the Stage Select code, start a game and press L + R + P.

This will open a debug menu that allows you to change the game attributes.

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

Start a game and go to the attack-craft select screen. Highlight your craft and press Button C. Hold down the top L and R buttons. While holding L and R, press and hold Buttons B and C. Continue to hold all four buttons and press the Stop button. This takes you to the Exit Game option. At this screen, continue to hold the four buttons and push Down on the directional pad. You'll hear a confirming sound. Do this for each craft you wish to make invincible.

This code does work in one and two player modes and must be done separately for each vehicle, or else it will not work. Choose a vehicle from the vehicle select screen, and then 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.

Enter these passwords into the Password Menu

Start a new game and go to the map-selection screen. Keep pressing Up on the directional pad until you reach the Password entry screen. Enter the password WOLF. You can now pick any level in the game.

Enter the password ZZZZ to remove access fromall previously completed levels.