Castlevania - Harmony of Dissonance - Platform: Gameboy Advance

Boss Rush mode:
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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.

Classic Simon:
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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.

Encyclopedia mode:
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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.

Glitch: Keep relics:
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Get all of the Dracula relics and go to Castle B. Equip both the JB and 
MK Bracelets. Go down into the room and you will start fighting Maxim 
after talking to him. Defeat Maxim and all the Dracula relics will start 
flying around and Dracula Wraith will appear. When the battle starts, 
enter the pause menu and go to "Relics". You will see that you still have 
all of the Dracula relics, even though they flew away and made Dracula.

Gradius reference:
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When you combine the Bolt Spellbook with the Bible secondary weapon, 
your character will have a double orb shield in front of him. 
This shield is one of the shields from Konami's classic Gradius series, 
with similar sound effects when it collides with enemies.

Gradius reference:
------------------
When you combine the Bolt Spellbook with the Bible secondary weapon, 
your character will have a double orb shield in front of him. 
This shield is one of the shields from Konami's classic Gradius series, 
with similar sound effects when it collides with enemies.

Hard mode:
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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.

Keep relics:
------------
Get all of the Dracula relics and go to Castle B. Equip both the JB 
and MK Bracelets. Go down into the room and you will start fighting 
Maxim after talking to him. Defeat Maxim and all the Dracula relics 
will start flying around and Dracula Wraith will appear. When the 
battle starts, enter the pause menu and go to 'Relics'. You will see 
that you still have all of the Dracula relics, even though they flew 
away and made Dracula.

Maxim Spells:
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The same spell that will call duplicate Maxims to fight enemies will 
summon a healing when all alone. Just face right, & in one continuous 
motion, push LEFT,DOWN, RIGHT, DOWN, LEFT + B. Thanks to NeT1Bler for 
the summoning directions. This spell will enable you, as Maxim, to 
travel further and not to have to worry so much about getting to a 
Save Point.

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

Play as Maxim Kischine:
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Enter MAXIM as a name after completing the game at least once. 
He is faster and jumps higher than Belmont.

Rare ghost:
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The Rare Ghost can only be seen in specific parts of the castle. 
The easiest is in the room below the Clock Tower B warp point. 
Keep entering and exiting the room until you see it. It will appear 
twice every twenty times at the very least. Once it sees you, it will run.

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

Summoning Tome:
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Go to Castle B's Skeleton Cave. First, have the Griffin's Wing and go 
into the double exit save room near the entrance area with the big pillar. 
While in the save room, save the game then use the Griffin's Wing and go 
through the roof. You will get Wizard's Urn and Summoning Tome.