Deltora Quest - Nanatsu no Houseki (デルトラクエスト七つの宝石) is a Nintendo DS game released in Japan in 2008. It is based on the popular children's fantasy book series, Deltora Quest, by Australian author Emily Rodda. The game follows the main characters, Lief, Jasmine, and Barda, as they search for the seven magical gems of Deltora in order to restore peace to their kingdom. Players must traverse the kingdom of Deltora, solving puzzles and battling monsters along the way. Players can also collect items to help them in their quest, such as weapons, armor, and magical artifacts. The game features a variety of mini-games and extra challenges, as well as an in-game encyclopedia to help players learn more about the world of Deltora. With its vibrant graphics and engaging storyline, Deltora Quest - Nanatsu no Houseki is sure to captivate fantasy fans of all ages.