Hatsune Miku: Project Diva is a rhythm game and the first game in the Project Diva series. 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. In addition, Sega has released Hatsune Miku: Project Diva Dreamy Theater, a downloadable game on the PlayStation Network for the PlayStation 3. It allows players to play Project Diva on the PlayStation 3 with updated visuals though it requires the PlayStation Portable to be plugged into the PlayStation 3 via a USB cable.