Cheats:

 Press [F11] during the game and then type in the codes:

 ISITWENTY20     Complete map
 ISILETSBAIL     Win the level successfully
 ISIJAVANET      Max shields
 ISIWHEELS       XCar available
 ISIDRIVE        All cars
 ISIMAKEITSO     All levels
 ISIBEENTHERE    Secret level available
 ISIFATPACKED    Homing ammo
 ISISLEEP        All enemies will sleep
 ISIQ            Invulnerability ON/OFF