CheatCodes.com has all the official Castlevania: Aria of Sorrow GBA cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Tuesday May 21, 2013 for Castlevania: Aria of Sorrow are shown below.
To get the Positron Rifle easily from Boss Rush, you need Claime Solais, Death soul, Medusa Head soul, Flesh Golem soul (if you easily run out of health quick), and Balck Panther. So start it off and just beat the crap out of every boss from creaking skull-death. When you get to Death, use the death soul and claime solais. When you kill death and get to Legion, stay right there with him and use the death soul and claime solais and he'll die easy. Now on to Balore. For the first part, just keep jumping and hitting him. The second part, use the medusa head right next to the eye and hit him. Graham, attack at first, then on the mutated version of him, duck down to the middle where Graham is. Keep attacking him until the skull formation is about to fire lightning. Then use skeleton blaze (slide). Then repeat until Graham is dead. If you don't get Positron Rifle the first time, try again.
To beat the Iron Golem just equip the Killer Mantle soul (if you have it) and attack the golem with it.
Successfully complete the game with the "Good" ending to unlock the "Sound" option under the "Special" menu at the title screen.
Successfully complete the game to unlock the "Boss Rush" option under the "Special" menu at the title screen. You are timed on how long it takes you to fight through all the Bosses from the game. Items are obtained depending on how long it took to defeat all the Bosses. Each can only be obtained once. A Potion is the reward if you get a time you got once before.
Successfully complete the game with the "Good" ending. When you start a new game, you can choose either the normal or hard difficulty. There are new items in hard mode, such as:Kaiser KnuckleDeath's RobeDeath Sickle.
To see the true ending, get all ancient books and defeat Graham (Dracula). You will be able to continue and go to the Chaos Dimension to battle Chaos. Defeat it to end the game.
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