Independence Day

At the name screen type in DAB DAB. After you do that go back to the start and push LEFT, RIGHT, SQUARE, CIRCLE, TRIANGLE, TRIANGLE, DOWN. You should be in the cheat menu.
All cheats will be able to use.

Special Cheat Screen

Go to the Options from the Menu Screen.Move down to the player name option.Enter the words below(in capital)on the Name Entry Screen.Then go back to the Main Menu Screen and press Left,Right,Square,Circle,Triangle,Triangle, Down.A new screen called "Cheater" will appear.
Listed here are all the codes that will turn the different options on or off in this screen:

FOX ROX:Opens up CITY.Select any level including bonus levels.

MR HAPPY:Opens up PLANE.Setting the plane to "BAC"will let you fly the alien craft on any level.

GODZILLA:Opens up KILL CIVIL(locks onto civillian objects) and KILL WING(locks onto wingmen and E3).

GO POSTAL:Opens up FAST RELOAD(quick missile lanches), DAMAGE BONUS(one missile to kill enemies)and WEAPONS (infinite missiles).

TOURIST:Opens up CITY,TOURIST(all aliens removed from the world),DEMO CAM(detatches camera from the plane. The game can't be played in this mode,but the camera is controlled by the control pad)and NO TIME(not timed).

LIVE FREE:Opens up INVINCIBLE(You'll take no damage).