Their is a leak that says their will be more than one ending Batman Arkham Knight. Their is a rumor that depending on how many missions you complete will affect the ending. At the moment we know of 11 side mission villains and 14 side missions. This affects Knight Fall Protocol which if you finish 7 missions then you get and ending called beyond the story if you finish all side missions then you get the full ending. Batman Arkham Knight is Rocksteady last ride as the dark knight tries to save a Gotham that is overrun as Scarecrow and Batman Rouge gallery with aid of Arkham Knight army has the police of GPD overwhelmed.
Article:http://asidcast.com/2015/06/06/batman-arkham-knight-will-have-multiple-endings/
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