Yes! Based on the ultimate mmorpg and greatest FF world, best FF gameplay, most epic challenges and most adventurous FF stories of all time!!! 
(as well as the most profitable, most expanded and most played FF in the entire franchise
http://massively.joystiq.com/2012/06/25/final-fantasy-xi-the-most-profitable-in-the-franchise/ )
And it’s free to play on PC!!
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