The first title in the series, the , premiered in Japan in 1987, and Final Fantasy games have been released almost every single year since. Fifteen games have been released as part of the main numbered series. Sequels, prequels, , and related video games have been published, as well as. Each game in the main series takes place in a different rather than serve as direct sequels to prior games, although some titles have received sequels, or prequels, set in the same universe. Most of the games have been re-released for several different platforms, many of which have been included in releases. The series as a whole is primarily composed of , but also includes , , , and. Final Fantasy games have been released on over a dozen beginning with the , as well as for and. The series is Square Enix's most successful franchise, having sold over 100 million units worldwide as of June 2011, across both the main series and its spin-offs. Final Fantasy 's popularity has placed it as one of the. Super NES and Game Boy Advance versions also available on the Wii U Virtual Console in Japan. Super NES and Game Boy Advance versions also available on the Wii U Virtual Console in Japan. Removed in 2013 and released on Steam. New mobile client under development for 2016. The Final Fantasy name was dropped for later SaGa games brought to North America. Release years by system: 1997 — Chocobo no Fushigina Dungeon Chocobo's 1999 — PlayStation Chocobo's Dungeon 2 1999 — PlayStation 1999 — PlayStation Chocobo Collection, includes Chocobo Racing, Chocobo Stallion and Dice de Chocobo 2000 — Hataraku Chocobo Chocobo on the Job 2002 — Dokodemo Chocobo Chocobo Anywhere 2002 — Chocobo Land: A Game of Dice 2003 — Mobile phones Dokodemo Chocobo 2: Dasshutsu! Yūreisen Chocobo Anywhere 2: Escape! Ghost Ship 2003 — Mobile phones Choco-Mate 2004 — Mobile phones Dokodemo Chocobo 2. Kodai Iseki Chocobo Anywhere 2. Ancient Ruins 2004 — Mobile phones Dokodemo Chocobo 3: Taose! 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