Harley Quinn Story Pack Gameplay Walkthrough part 1 within Batman Arkham Knight Part 2 (ENDING) - https://www.youtube.com/watch?v=JiK1nnvRaKI Subscribe! Batman: Arkham Knight is an action-adventure video game developed by Rocksteady Studios and published by Warner Bros. Interactive Entertainment for the PlayStation 4 and Xbox One video game consoles, and Microsoft Windows.