There is a secret stage after you win
the Ice Cave stage. It waits for a
player who can complete all three bonus
stages and all seven regular stages.
The third bonus stage is played after
Fortress if you have already won the
first two bonus stages.
To reach the second bonus stage you will
need to complete Tokyo, Pacific
Ocean, and Air Battle very quickly. If
it's sunset when you reach the Desert
stage you're already too late to save
To reach the first bonus you must
complete Tokyo and the Pacific Ocean
stages with a very high score.
On the title screen, (full screen logo,
and "Press Start") NOT the main
menu screen, press the following
buttons: C-Left, C-Down, C-Right, C-Up,
C-Left, C-Right, C-Down. Don't be
discouraged when you don't hear a
sound or see something new, because
nothing will happen. Go to any plane
select screen, and on the far left, you
will see a new F-15 plane with a girl
Press R at the plane select screen.
(NOTE: This trick only works in Main
Game and Boss attack)
In the intro before the planes fly
press: (on the D-Pad)Up C-Down Left
C-Right Down C-Up Right C-Left Z R L
then goto main game then select a level.