Castlevania: Harmony of Dissonance Unlockables & Cheat Codes

Play as Maxim Kischine
Enter MAXIM as a name after completing the game at least once.

No Magic
Enter NO MAGIC as a name after completing the game at least once.

Hard mode
Enter HARDGAME as a name after completing the game at least once. A voice can be heard at the start of the introduction to confirm correct code entry.

Boss Rush mode
Successfully complete the game to unlock the Boss Rush option. There are three levels (easy, normal, and hard) that must be unlocked by playing each in succession, starting with easy.

Play as Simon Belmont in Boss Rush Mode
Unlock Boss Rush mode, then press Up(2), Down(2), Left, Right, Left, Right, B, A, Select at the Konami logo.
Select Boss Rush mode to play as the NES version of Simon.

Play as Maxim Kischine in Boss Rush Mode
Unlock Boss Rush mode, then hold L + R at the Boss Rush menu. Keep the buttons held until the difficulty setting is selected. You will now control Maxim in Boss Rush mode.

Sound test mode
Successfully complete the game with the good ending (where you rescue Maxim and Lydie).

Encyclopedia mode
Get the Monster Tome relic during game play to unlock the "Encyclopedia" option at the "Secret Info" menu, which details all monsters that you have defeated.

Collectibles mode
Get any collectible during game play to unlock the "Collectibles" option at the "Secret Info" menu, which lists all the collectible items that you have found