Unlock Boss-Only Mode and Music Room
After finding Artifact, the Boss-Only Mode and the Music Room can be unlocked. To unlock Boss-Only Mode, obtain the Mysterious Button from D’Artagnan in Chapter 5, Area 002. There is a chance the item may not be dropped from D’Artagnan, so equipping the Thief's Dagger may increase the chance of finding it. After obtaining the Mysterious Button, at the Title Screen, press the Pause button and you can fight the bosses of each chapter. To unlock the Music Room, look for the Music Room Key at the bottom-most part of Chapter 6 just before reaching the corridor housing power-ups and enemies leading into the final bosses. After obtaining the Music Room Key, you can listen to the music of the game from the Title Screen.
Unlockable How to Unlock Boss-Only Mode Obtain the Mysterious Button from D’Artagnan in Chapter 5. Once obtained, press the Pause button at the Title Screen to play Boss-Only Mode. Music Room Find the Music Room Key in Chapter 6, in the area lower-right corner of the area before the corridor containing power-ups and ghosts.
Unlock Terror and Nightmare difficulty
After obtaining a specific Artifact in the game and meeting certain conditions, two extra difficulty levels can be unlocked. To unlock Terror difficulty, you must find the Terror Medallion from of the Black Star armors found hidden in Chapter 4, Area 017. After getting the Artifact, clear the game on Hard mode and slay a total of 8,000 or more enemies in the game to unlock Terror Mode (your progress of how many enemies you slain can be seen in the Results screen and the Title Screen becomes increasing more red with each enemy killed). There is a chance you may not get the item from the Black Star armors, so bringing the Thief's Dagger may help increase the odds of earning it. To unlock Nightmare difficulty, you kill the Nightmare of Legend in Chapter 3, Area 040. Once it's defeated and you've earn the Nightmare Medallion, clear the game on Terror difficulty to unlock Nightmare Mode.
Unlockable How to Unlock Nightmare Mode Obtain the Nightmare Medallion from the Nightmare of Legend in 3-040. Afterwards, clear the game on Terror mode. Terror Mode Obtain the Terror Medallion from the Black Star armors hidden in 4-017. Afterwards, clear Hard mode and slay a total of 8,000 enemies or more.
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