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Dragon Quest III is set many years before the original Dragon Warrior in a world separate from the first two games.  A wicked fiend named Baramos threatens to destroy the world. The story revolves around the Hero,  son or daughter (the player can choose to be either male or female, with few gameplay changes) of the legendary warrior Ortega. On their sixteenth birthday, the Hero (from here on referred to as “they” for the sake of convenience) is summoned to the castle and is given by the King of Aliahan the challenge to rid the world of the evil archfiend Baramos, which Ortega attempted in the past but seemingly perished in a volcano. The Hero then is able to recruit up to three traveling companions to help fight Baramos.

Dragon Quest III is noted for greatly expanding upon the gameplay of the original Dragon Quest and Dragon Quest II. The game uses basic role-playing video game conventions such as leveling up by gaining experience points and equipping items. The battle system is turn-based like the other games in the series, though the remakes incorporate various interface changes from later titles. These include simpler door opening, a bag to store items instead of keeping them at a bank, quick item sorting with “Tidy Item” and “Tidy Bag” command, and a “Full HP” command to automate the process of casting healing and status restoring spells. And while earlier Dragon Quest games were non-linear in structure, Dragon Quest III featured an even more open-world experience. It also allowed the player to freely swap characters in and out of their party and introduced the day/night cycle in which certain items, characters, and quests are only accessible at specific times of the day.