When you complete the game, one of five endings will appear. An extra menu 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.
Unlock all five normal endings. A special prologue will appear, allowing you to play again and unlock the "Extra" ending. In EX Mode, you must find the elixir of life for Mrs. Wagner.
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.
Successfully complete all chapters with a 100% ranking to view Margarette and Dana at the title screen.
When you find yourself 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.