Batman Arkham Origins Free @ Google Play

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Na, na, na, na, na, na, na, na, Batman!
Prove your worth as Gotham’s Dark Knight, facing off against a slew of deadly assassins and their thugs in the new mobile game, Batman Arkham Origins. Fight your way through Gotham City’s most dangerous locales in this free to play brawler from NetherRealm Studios.

Offers in-app purchases but not essential.

I don't know much about Google play so if this is freemium I apologise in advance.