Nintendo Gameboy Advance: Cheats and Tips
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Unlock Sound Test Mode
Complete the game with the good ending to unlock Sound Test mode.
100% success rate. 

Maxim Kischine
Enter 'MAXIM' as a name after completing the game at least once.
100% success rate. 

Unlock Boss Rush Mode
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.
100% success rate. 

Hard Mode
Enter 'HARDGAME' as a name after completing the game at least once.

Above are all the Castlevania: Harmony of Dissonance cheats, codes, tips, hints, secrets and walkthoughs that are currently in the Cheat Chest database. Because we do not have every game for Nintendo Gameboy Advance, Cheat Chest unfortunately can not guarantee that each Castlevania: Harmony of Dissonance cheat we have works. If any of the cheat codes above is incorrect, please rate the Castlevania: Harmony of Dissonance cheats at our partner site Neon Gaming, as enough bad ratings will automatically remove the cheat from our database.