Play as Mao Mao
To fly with Mao Mao (in her F-15), wait for the words, "Press Start" to appear at the opening screen before pressing: left-C, down-C, right-C, up-C, left-C, right-C, down-C.

Alternate Color Scheme
For a different color, press R at the plane selection screen.
(Note: In Death Match mode, alternate color schemes are available for default aircraft only.)

Stage Select
To choose a stage, press UP, down-C, LEFT, right-C, DOWN, up-C, RIGHT, left-C, Z, R, Z before the title screen appears. (A chime confirms correct entry.)

Unlockable: Bonus Level
To get to the secret level, you must complete EVERY level, including the bonus levels. When you beat the Ice Cave with all other levels complete, you go to a new level -- The Moon. You will have no wingman support though.

Hint: Tomcat Trick
While flying the F-14, use your special weapon (Ninja Beam), fire a missile then chaff (in that order). The Tomcat will launch multiple armaments from its weapons platform - 5 Tomahawk cruise missiles and 4 heat-seeking Tornado Stars!

Unlimited Continues
For unlimited continues, reset the game and continue the previous game from the main menu.
(Note: You must have at least one continue.)

Shortcut in Ice Caves
When you start flying the Ice Caves as any fighter, slow down before the first drop at the very beginning. As you are coming down, turn your plane around and there will be a protected hole in the wall behind you. Fly through it and it takes you straight to the boss without ANY damage being done by the enemies you would normally encounter.