When the second game was localized for the American audience, there was concern about the slime's identifiability with the public, and so "Dragon Quest" was added to the title. Watabe wanted to make sure that "Rocket Slime" used both screens for gameplay, unlike most other DS titles that just used it for menus, believing that the duel screens was the consoles "focus". Early in the title's life, the developers had a version of it that uses the touch screen to use Rocket's Elasto Blast technique, but scrapped the idea, due to it being too hard to control. In a search for what to do with the Nintendo DS's two screens, the developers arrived at the idea of a tank battle, and a duel view allowing players to see inside and outside the tank at once. Each character name was approved during localization by Square Enix, and names involving American cultural references had to be explained in Japanese, a task that saw many jokes cut and replaced.