CASTLEVANIA: DAWN OF SORROW UNLOCKABLES
Mina doll
Have the Game Boy Advance game Castlevania: Aria Of Sorrow in the cartridge slot. You will see a Mina doll in the background of Yoko's shop waving her arms.
Rare Ring
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.
Completion bonuses
After finishing the game with the best ending you will unlock Boss Rush mode, Sound Test mode, and New Game +. Finish the game with Soma on the hard difficulty setting to get the Hell Flame Soul (triple fireball) move. After finishing the game with any ending you will unlock Julius mode.
Unlock Alucard in Julius mode
Enter the Demon Guest House from the lower right enteric. When you enter, Alucard will have a conversation with Julius and he will join your team. Alucard has his Alucard Sword and the High Jump Boots. He can also turn into a bat. He can use his Hellfire ability to attack from afar.
Potion
Finish Boss Rush mode to unlock the Potion.
Terror Bear
Finish Boss Rush mode in less than eight minutes to get the "Terror Bear" weapon.
Nunchakus
Finish Boss Rush mode in less than seven minutes to get the "Nunchakus" weapon.
Death Robe
Finish Boss Rush mode in less than six minutes to get the "Death Robe". It a powerful armor, but Dracula's Tunic is better.
Rocket Launcher (RPG)
Finish Boss Rush mode in less than five minutes to get the Rocket Launcher "RPG".
Chaos Ring
Get 100% of the Souls to get the Chaos Ring, in the abyss.