The World Ends with You's combat system is called the Stride Cross Battle System. The combat takes place across both screens on the DS, with Neku on the touchscreen and his partner on the top screen, representing the different "zones" of the same local area; the two characters battle the same enemies that exist in both "zones" simultaneously. Neku and his partner are synchronized during battle; they share the same health bar so that even if one character does not take any damage, the pair can fail in battle if the other takes too much.