Rei Zero (PlayStation 2)

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Alternate ending

Successfully complete the game under the nightmare difficulty setting. Note: You must play from beginning to end.

Chapter select

Successfully complete the game under the nightmare difficulty setting. A "Chapter" option will be unlocked in story mode.

Ending bonuses

Successfully complete the game to unlock the "Battle Mode", "Ghost List", "Sound Test", and "Special Function" options as well as alternate costumes.

Nightmare mode

Successfully complete the game in battle mode.