Hatsune Miku
Hatsune Miku was the first Vocaloid developed by Crypton Future Media after they handled the release of the Yamaha vocal Meiko and Kaito. The name of "Hatsune Miku" was conceived soon after the Vocaloid 2 announcements, when an English and Japanese vocal were developed for the character. The intended design was delayed and later used for Megurine Luka instead. Miku was intended to be the first of a series of Vocaloids called the ""Character Vocal Series"", which included Kagamine Rin/Len and Megurine Luka. Each had a particular concept and vocal direction.
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.