Unlockable: Boss Rush
Finish the entire game with best ending (All bosses).

Unlockable: Julius Mode
First, you must equip Paranoia Soul. Then without Mina's charm equipped,go into the mirror that enables you to fight Dario's inner demon, Agni. After this, Julius Mode is unlocked.

Unlockable: Sound Test Mode
Finish the game with the best ending and the Sound Test Mode will become selectable in the Main Menu.

Unlockable: Play as Alucard In Boss Rush
You must be the game with Soma and get 100% completion, and also complete the Julius mode. Go to the the title screen and wait until the konami logo appears. Then enter UP, DOWN, and hold UP. You will hear the sound of a door opening. Enter Boss Rush mode, and you will be Alucard with his Alucard Set.

Unlockable: Hell Flame Soul
Finish Hard Mode with Soma.