F-15 and Mao-Mao
Press [C-Left], [C-Down], [C-Right],
[C-Up], [C-Left], [C-Right], [C-Down] when
"Press Start" appears on the opening screen. A hidden
F-15 with a female pilot (Mao Mao) can now be accessed.
Level select
Press [Up], [C-Down], [Left], [C-Right],
[Down], [C-Up], [Right], [C-Left], [L],
[R], [Z] during the opening sequence when the fighters
are in flight. A sound will confirm correct code entry. Note:
The code must be entered before the title screen appears.
Alternate plane color
Press [R] at the plane selection screen in main
game, practice or boss attack modes. For death match mode, hold
[R] while selecting one of the four default planes.
Bonus missions
Complete the following tasks to unlock each bonus mission.
Air Docking: Accumulate a very high score.
Shuttle Defense: Quickly complete all the levels before the "Desert"
level.
Goliath Defense: Successfully complete the first two bonus levels.
Space: Successfully complete all regular missions and "Air
Docking", "Shuttle Defense", and "Goliath
Defense" before reaching the "Ice Cave" level.
Successfully complete the "Ice Cave" level to unlock
the "Space" level.
F-14 super-attack
Fire the special weapon followed by a missile and then
chaff while flying the F-14. Five Tomahawks and four heat-seekers
will then be fired.
Spanky
Find and successfully compete all bonus missions to
unlock Spanky, the second hidden pilot.
Fly enemy planes in deathmatch mode
A new enemy plane will be available in deathmatch mode
for each level completed during game play. A total of six enemy
planes may be enabled.
Unlimited continues
Before reaching one credit remaining, reset the game
and continue from the menu that immediately follows the title
screen. The game will resume with the same number of credits that
were available when the current stage was started.