IRIS was the codename for the intended fifth model in the Game Boy lineup, following the Game Boy Advance SP. According to Satoru Okada, the name was chosen based on the month of May (the fifth month in the year), symbolized in hanafuda by the iris flower. While development was progressing smoothly on the project, at the time president Satoru Iwata told Okada that former president Hiroshi Yamauchi wanted the system to have two screens, similar to a Game & Watch. While Nintendo was initially against the idea, it was Yamauchi's suggestion that would lead to the development of the Nintendo DS.
In 2005, one year after the Nintendo DS launch, a fifth Game Boy model, the Game Boy micro, was released
- Former Nintendo designer on the creation of Game & Watch, Game Boy, DS. Nintendo Everything (December 29, 2016). Retrieved January 4, 2017.