Chopper attack codes
Press C-Up(7) when "Press Start" appears on the opening screen.
Hold Z and press Right, Left, Up, Down, A, B, Start when "Press Start" appears on the opening screen.
Shoot down the President:
Press Z + C-Up + C-Down during game play, then fire a homing cluster at an enemy plane.
Hold L + R + Z and press Start at the main menu before selecting a chopper.
Highlight a chopper on the chopper selection screen. Press L to display the statistics screen. Press the Analog-stick to control the rotating model of the chopper.
Complete level 7 under the expert difficulty level. Then, fight on the moon to purchase the alien homing plasma weapon.
Locate King 10 in level 7, defeat him, then complete the mission.
Locate Stingray in level 7, defeat him, then complete the mission.
Hint: Defeating the level 6 Boss:
Fly under the large green plane at the end of level 6. Shoot the large green missiles up into the plane for an easier battle.