Boss Only mode:
To unlock Boss Only mode, obtain the Mysterious Button from D’Artagnan on level 5 under the Normal or higher difficulty.
Fear difficulty:
To unlock the Fear difficulty setting, obtain the terror medallion from one of the three black star enemies on level 4 under the Hard difficulty setting. Then, complete the game under the Hard difficulty setting.
Planeriel difficulty:
To unlock the Planeriel difficulty setting, obtain the nightmare medallion from the Nightmare Of Legend enemy on level 3 under the Fear difficulty setting. Then, complete the game under the Fear difficulty setting.
Music room:
To unlock the music room, find the music room key on level 6 under the Normal or higher difficulty setting.
Trophies:
Bronze trophies
Vizet Boot Camp – Finish Tutorial.
Ancient Scholar – Collect all Archive artifacts.
Bone Collector – Collect all items.
Artifact Collector – Collect all Artifacts.
Boss Only Mode – Obtain the Mysterious Button.
Silver trophies
Magic Knight – Defeat NORMAL, Magic Knight mode.
Sacred Knight – Defeat HARD, Sacred Knight mode.
Terror Knight – Defeat FEAR, Terror Knight mode.
Music Room – Obtain the Music Room Key.
Brave Knight – Defeat Boss Only mode.
Gold trophies
Pale Mist Knight – Defeat PLANERIEL, Knight of Nightmare mode.