Get the Mysterious Button from D'Artagnan in Chapter 5: Area 002 on the Normal or higher difficulty. Note: Since the item may not be dropped by D'Artagnan, use the Thief's Dagger to increase the chance of it appearing. To activate Boss mode, press [Pause] at the title screen. You will then fight the Bosses of each chapter.Nightmare mode
Get the Nightmare Medallion after defeating the Nightmare Of Legend in Chapter 3: Area 040 on the Fear difficulty. Then, successfully complete the game on the Terror difficulty to unlock the Nightmare difficulty.Terror mode
Get the Terror Medallion from one of the three Black Star enemies in Chapter 4: Area 017 on the Hard difficulty. Note: Use the Thief's Dagger to increase the chance of it appearing. Then, successfully complete the game on the Hard difficulty with over 10,000 enemies killed to unlock the Terror difficulty.Music room
Find the music room key in Chapter 6 on the Normal or higher difficulty. It is located at the bottom-most part of the chapter, just before reaching the corridor with power-ups and enemies leading into the final Bosses. You can then listen to the game's music at the title screen.Trophies
Successfully complete one of the following tasks to get a trophy:
- Vizet Boot Camp (Bronze): Finish the tutorial.
- Ancient Scholar (Bronze): Collect all Archive artifacts.
- Bone Collector (Bronze): Collect all items.
- Artifact Collector (Bronze): Collect all artifacts.
- Boss Only Mode (Bronze): Obtain the Mysterious Button.
- Magic Knight (Silver): Defeat NORMAL, Magic Knight mode.
- Sacred Knight (Silver): Defeat HARD, Sacred Knight mode.
- Terror Knight (Silver): Defeat FEAR, Terror Knight mode.
- Music Room (Silver): Obtain the Music Room Key.
- Brave Knight (Silver): Defeat Boss Only mode.
- Pale Mist Knight (Gold): Defeat PLANERIEL, Knight of Nightmare mode.