Castlevania: Aria of Sorrow
Game Boy Advance
Use no souls:
Start a new game using NOSOUL as a name.
Use no items:
Start a new game using NOUSE as a name.
Play as Julius Belmont:
Beat the game with a good ending. Now start a new game using JULIUS as a name.
Find the Flame Demon, Succubus and Giant Bat souls. Equip all three and battle Graham. After the two battles, you'll be able to go to Chaos Realm. To get there, go to the sealed door at the Clock Tower. Get there by going right until you find a room with rippers; now go down to the misty room with Julius inside. After beating him, you'll fight Chaos in Chaos Realm.
Equip the Flame Demon, Succubus and Giant Bat souls. Beat Graham and Julius, but lose to Chaos.
Beat the game without getting the Flame Demon, Succubus and Giant Bat souls.
Boss Rush mode:
Beat the game to unlock this in the Special menu.
Hard mode and Sound mode:
Beat the game with the 'Good' ending. You'll find Souns mode at the Special menu.
Thanks to Revolution readers Eirhjien, Wampo and Marcus C!