Tamagotchi Nano
Released October 2010
Tamagotchi Nano served as a follow-up to the Tamagotchi Mini. It was slightly more robust, featuring more interactivity and an actual game. The first three releases of the Nano were based on the iD, while the fourth and final release was based on the iD L. There were three promotional shell designs.
Later on, the Nano became the standard for licensed partnerships with popular franchises like Demon Slayer, Pokémon, and Toy Story. These Nanos have a dedicated page here.