American Girl - Kit Mystery Challenge! (USA), ナイツ＆ミステリー！キットはいつも大冒険 (Nights & Mystery! Kit is always a big adventure) is an adventure game for the Nintendo DS released in 2010. The game follows Kit Kittredge, a 9-year-old girl living in 1934 Cincinnati and her adventures with her friends. Players have to help Kit solve mysteries, from finding a missing dog to discovering the identity of a mysterious stranger. Along the way, players will explore the city of Cincinnati, meet the people who live there, and learn about the history and culture of the time. As players progress, they'll unlock puzzles and mini-games, which will help them solve the mystery. Kit Mystery Challenge! also features bonus activities such as creating a scrapbook and playing classic board games. The game offers a unique and fun way to explore an important part of American history.