Fly as a cow :
At the ship selection screen, press Up, Left, Down, Up, Left, Down, Right, Left, Down, Right, Square, Cross, Circle. Alternatively, enter "LLLLLLLLLLLLLL" as a password and press Cross.

Super vehicle :
Enter "VVVVVVVVVVVVVV" as a password, then on the ship selection screen, select the unnamed vehicle.

Display game compilation information :
At any menu screen, press Up, Left, Right, Triangle, Circle, Square, Left, Right, Square, Circle. Then, the compilation time and date of the game will be displayed.

View FMV sequences :
At the language-selection screen, press Circle, Square, Triangle, Left, Right, Up, Square and Right.

Track passwords :
2 JCBQCBBBCBCDBB 
3 JDBZCDDCCCDDBB 
4 JFB5DFDCCCFGBB 
5 JHBCFFFCCCGJBB 
6 ?
7 JJBKFGFCCDHLBB 
8 JLBSHGGCDDJLBB