Gakken DS - Otona no Gakushuu - Kindaichi Sensei no Nihongo Lesson (ガッケンDS　大人の学習　金田一先生の日本語レッスン) is a Nintendo DS game released in Japan in 2008. This educational game was developed by Gakken, a Japanese educational publisher, and is based on the popular Japanese manga series Kindaichi Case Files. Players take on the role of a student of the titular character Kindaichi, and learn Japanese language and culture through a series of lessons. The game is divided into two main modes: Lesson Mode and Quiz Mode. In Lesson Mode, players learn Japanese through a series of interactive lessons, including grammar, vocabulary, and cultural topics. Each lesson is divided into five stages: introduction, lecture, practice, review, and evaluation. The lectures and practice sessions use a combination of audio, visual, and written content to help players understand the material. After completing each lesson, players can take a quiz to test their knowledge. In Quiz Mode, players can take a variety of quizzes to test their knowledge of the material. There are two main types of quizzes: Multiple Choice and Fill-in-the-Blank. Each quiz has multiple questions and players must answer them correctly to progress. Players can also take a “Friend Test” where they can challenge their friends to see who knows the material better. Overall, Gakken DS - Otona no Gakushuu - Kindaichi Sensei no Nihongo Lesson is an interactive and engaging way to learn Japanese language and culture. With its combination of audio, visual, and written content, players can learn the material at their own pace and test their knowledge with quizzes.