Extra
option:
When the game is completed, one of five endings will appear. An
"Extra" option will now be available at the title screen, which
allows you to view the percentage completed for every chapter. You
can also start the completed game over again at the beginning to try
to do better and get a different ending.
Restore energy units:
If you begin running out of energy units, allow yourself to die. The
moment you are brought back to life, you will get an energy unit for
free. For example, if you let yourself die five times in a row you
will get five energy units for free. Do this trick each time you
begin a new chapter.
Extra
ending:
Unlock all five normal endings. A special prologue will appear,
allowing you to play again and unlock the "Extra" ending.
FMV
sequences:
Successfully complete the game to unlock a FMV sequence from the
Spring 2000 Tokyo Games Show. Successfully complete the game after
getting three different endings to unlock a FMV sequence from a
private Konami game show in Europe. Successfully complete the game
after getting all five normal endings and the "Extra" ending to
unlock a FMV sequence from the Fall 2000 Tokyo Games Show.