AlphaDream Corporation, Ltd. (formerly known as AlphaStar) was a video game development company founded in 2000 by Tetsuo Mizuno in Tokyo, Japan. In partnership with Nintendo, it produced software for the Game Boy Color, Game Boy Advance, Nintendo DS, Nintendo 3DS, and Nintendo Switch, including the Mario & Luigi series. The company's staff included prominent former developers from Square, such as Chihiro Fujioka. On October 1, 2019, AlphaDream was shut down after declaring bankruptcy.