ドラゴンクエストIX 星空の守り人 (ドラゴンクエストIX ほしぞらのしょりにん) is a role-playing game developed and published by Square Enix for the Nintendo DS. It is the ninth installment of the popular Dragon Quest series, and the first to be released on a handheld console. The game was released in Japan in July 2009, and in Europe in July 2010. Dragon Quest IX is set in the world of Angel Land, where the player takes on the role of a guardian angel who has been sent to protect the town of Angel Falls. The game features a large, open world to explore and a variety of side quests and activities to complete. Players can customize their characters with different jobs, weapons, armor, and accessories. The game features a turn-based battle system, with a variety of enemies to fight and items to collect. Players can also use special abilities, such as spells and special attacks. The game also includes a multiplayer mode, allowing up to four players to join together to play through the game. Dragon Quest IX has been praised for its engaging storyline, vibrant graphics, and rewarding gameplay. The game has sold over 4.2 million copies in Japan, making it one of the best-selling games on the Nintendo DS.