Alternate ending: Successfully complete the game under the nightmare difficulty setting. Note: You must play from beginning to end. Nightmare mode: Successfully complete the game in battle mode. Fatal mode: Successfully complete the game multiple times under the normal and nightmare difficulty settings with a high rank. Chase special function: Successfully complete battle mode with an "S" rank to unlock the Chase special function for the camera. Sense special function: Successfully complete battle mode with any rank to unlock the "Sense" special function for the camera. Zero special function: Complete the ghost list and finish the game to unlock the "Zero" special function for the camera. Screen saver: Allow the game to be paused for a few minutes. The "ghosts" will begin to put their bloody hands on the screen.