Nightmare mode
Successfully complete the game in battle mode.
Chapter select
Successfully complete the game under the nightmare difficulty setting. A "Chapter" option will be unlocked in story mode.
Alternate ending
Successfully complete the game under the nightmare difficulty setting. Note: You must play from beginning to end.
Ending bonuses
Successfully complete the game to unlock the "Battle Mode", "Ghost List", "Sound Test", and "Special Function" options as well as alternate costumes.