Castlevania - Dawn Of Sorrow - Platform: Nintendo DS

Completion bonuses:
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Successfully complete the game with the best ending to unlock Boss 
Rush mode, Sound Test mode, and New Game +. Successfully complete the 
game with Soma on the hard difficulty setting to get the Hell Flame 
Soul (triple fireball) move.

Julius mode:
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Equip the Paranoia soul and without Mina's charm equipped, enter the 
mirror to fight Dario's inner demon.

Play as Alucard in Boss Rush mode:
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Successfully complete the game with Soma with a 100% completion and 
complete Julius mode. Then at the Konami logo, press Up(2), Down(2), 
Left, Right, Left, Right, B, A. Remain idle until the Konami logo 
appears again, then press Up, Down, then hold Up until the sound of 
a door opening is heard. Select Boss Rush mode to play as Alucard 
with his Alucard Set.

Attack faster:
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If you have a heavy weapon like a great sword, slow attacks can be 
a problem. To hit an enemy twice quickly, stand very close to them 
and attack. Then just as it connects, press L to dash backwards. 
As soon as it stops, you can attack again; if you are still close 
enough it should hit. This is quicker than just attacking twice normally.

Chaos Ring:
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Get 100% of the Souls to get the Chaos Ring, in the abyss.

Death Robe:
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Finish Boss Rush mode in less than six minutes to get the "Death Robe". 
It a powerful armor, but Dracula's Tunic is better.

Easier Boss Rush mode:
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Activate the Devil Soul and use the Valmanway Sword. You can take down 
all the Bosses in less than five minutes.

Nunchakus:
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Finish Boss Rush mode in less than seven minutes to get the "Nunchakus" 
weapon.

Play as Alucard in Boss Rush mode:
----------------------------------
Successfully complete the game with Soma with a 100% completion and 
complete Julius mode. Then at the Konami logo, press Up(2), Down(2), 
Left, Right, Left, Right, B, A. Remain idle until the Konami logo 
appears again, then press Up, Down, then hold Up until the sound of a 
door opening is heard. Select Boss Rush mode to play as Alucard with his 
Alucard Set.

Rare Ring:
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Have the Game Boy Advance game Castlevania: Aria Of Sorrow in the cartridge 
slot and start a new game to have the Rare Ring in your inventory.

Rocket Launcher:
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Finish Boss Rush mode in less than five minutes to get the Rocket Launcher "RPG".

Terror Bear:
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Finish Boss Rush mode in less than eight minutes to get the "Terror Bear" weapon.