Key Terms also play a pivotal role in the Arcane Labyrinth, a bonus dungeon added in the PSP and iOS versions. Key Terms are used to unlock new floors in the dungeon, with each Key Term having a unique level and a level task, which were usually for Arcane Labyrinth specific Key Terms or hints for other floors. The Arcane Labyrinth added a total of 30 new terms to the game's original 15, bringing the total number of Key Terms to 45.