Final Fantasy XI [a] , also known as Final Fantasy XI Online , is a massively multiplayer online role-playing game (MMORPG), developed and published by Square (later Square Enix ) as part of the Final Fantasy series. Designed and produced by Hiromichi Tanaka , It was released in Japan on May 16, 2002 for PlayStation 2 and Microsoft Windows -based personal computers in November of That year. The game is the first MMORPG to offer cross-platform play between PlayStation 2 and personal computer.  It was also the Xbox 360’s first MMORPG.  All versions of the game require a monthly subscription to play.