Atelier Iris 3: Grand Phantasm Cheats - PlayStation 2
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Unlock the true ending
After you completed every quest, the last quest "Truth in Darkness" will be reveal on the board at the Guild. After complete "Truth in Darkness" quest, then create the Shadow Gem by using the item synthesis on Ruby Prism (from another item synthesis on Aroma Material, Brilliant Stone, Dunkelhite and Dragon Tongue) and Broken Gem (which you got from the "Truth in Darkness" quest. And last, go face the final boss Uroboros and beat him to see the True Ending.
Extra Menu
After completing the game and saving your clear data, if you go back to the Title Screen, you'll notice a new Extra option. In here, you can view all the lists you could ingame such as a Monster List, Blade List, and so on. You can also listen to the music of the game and hear the Japanese VAs for some of the characters in the CAST section.