Hatsune Miku: Project DIVA (初音ミク -Project DIVA-) is a 2009 rhythm game created by Sega and Crypton Future Media for the PlayStation Portable. The game was first released on July 2, 2009 in Japan with no international release. The game primarily makes use of Vocaloids, a series of singing synthesizer software, and the songs created using these Vocaloids most notably the virtual-diva Vocaloid Hatsune Miku. The game is the first video game to utilize the Vocaloid software developed by the Yamaha Corporation. Source: Wikipedia, "Hatsune Miku: Project DIVA (video game)", available under the CC-BY-SA License.