Hatsune Miku
A series of rhythm games starting from "" were produced by Sega under license using Hatsune Miku and other Crypton Vocaloids, as well as "fan-made" Vocaloids like Akita Neru. TinierMe also made attire that looks like Miku's for their services, allowing users to make their avatar resemble her. The series has sold 6million copies. "" was developed for the Nintendo 3DS. Miku's appearance in this game is based on the Nendoroid series of figures. Hatsune Miku is also briefly referenced in the game "Recettear", where a young man stargazing sees "The Green-Onion Girl" constellation. Also, in 2013, Saki Fujita voices Fei-Yen HD, a character based on one of Hatsune Miku's modules, in "Super Robot Wars UX"; this appearance does not use Miku's vocal library.
Miku Flick/02
Unlike its predecessor, the game featured vocaloids other than Hatsune Miku, including Kagamine Len, Kagamine Rin and Megurine Luka as well as duet songs whereby two vocaloids would sing together for a song. The game also included a new "Extreme" difficulty mode, which provided players with a difficulty between that of the "Hard" and "Break the Limit" modes, retained from the original. The game also provided additional Downloadable Content via the In-App Purchases system that would include new songs and seasonal costumes. The additional "Replay Mode" was later added, allowing players to save a replay of their performance and share it with friends.