Castlevania: Dawn Of Sorrow cheats and cheat codes for Nintendo DS

Unlock Boss Rush, Sound Teste, and New Game+ options. 
Finish the game once with the best ending.

Unlock Flame Soul move:
Finish the game once in the hard mode with Soma

unlock Julius mode:
Finish the game once with any ending

Unlock New Ring:
Insert Castlevania: Aria Of Sorrow GBA game into cartridge 
and start a new game.

Alucard In Boss Rush mode:
Finish the game with Somah (need to 100% completion).
After complete the unlocked Julius mode. On the Konami logo press:
Up, Up, Down, Down, Left, Right, Left, Right, B, A 
Don't move until the Konami logo will reappears. Then press 
Up, Down, then hold Up until the you hear a door opening sound.
You can play with Alucard in Boss Rush mode 

Unlock Potion: Finsh the Boss Rush mode. 
Unlock Terror Bear: Finish Boss Rush mode in maximum 8 minutes
Unlock Nunchakus: Finish Boss Rush mode in maximum 7 minutes
Unlock Death Robe: Finish Boss Rush mode in maximum 6 minutes
Unlock RPG: Finish Boss Rush mode in maximum 5 minutes
Unlock Chaos Ring: Get 100% of the Souls

Worst ending: Beat Dario Bossi in the 2nd battle.

Bad ending:
Enter the mirror by using the Paranoia Soul during the 2nd battle. 
Beat Aguni, after go back to the other side of the mirror.
Get the Magic Seal. Return back to center of the castle.
Beat the Boss without Mina's Talisman and finish the game.

Best ending:
Fight Aguni and use in the battle the Paranoia Soul. Get the Magic Seal.
After go back to center of the castle. Equip yourself with Mina's Talisman, 
beat the Boss and finish the game.