Extra Planes
     Enter any of the following "Codes" at the Plane Select screen:

Plane                   Code
F19                     Up, Down, R1, Circle, Square, Left, L1
F117                    Square, R1, R2, Square, Up, Square, L2

Level Select
     At the Title screen, press L2, L1, Triangle, Up.

Play Vs Mode in 2nd Boss Stage
     At the Vs Mode Selection screen, press L2, L1, Square, Down.

Play Vs Mode in Boss Stage
     At the Vs Mode Selection screen, press L2, L1, Square, Up.

Various Cheats
     Enter any of the following "Codes" while playing:

Effect                     Code
User Laser Weapon         Left, Up, Right, Triangle, Select, Left, Right, X
Increase Homing Missiles  Right, Down, Left, Up, Triangle, Select, R1, R2, X
Infinite S.Skill          Right, Down, Left, Up, Triangle, Select, Left,
                          Right, X