Dragon Quest (localized as Dragon Warrior) is the original Dragon Quest game and the first in the Dragon Quest game series. It was developed by Enix and released in 1986 in Japan for the MSX and the NES. The game was localized for North American release in 1987, but the title was changed to Dragon Warrior to avoid infringing on the trademark of the pen and paper game DragonQuest. The North American version of the game was greatly improved graphically over the Japanese original, and added a battery backed-up save feature, whereas the Japanese version used a password system. Nintendo was impressed with the Japanese sales of the title and massively overproduced the cartridge; the end result was that Nintendo gave away copies of Dragon Warrior as an incentive for subscribing to Nintendo Power,