I finished the story in Batman: Arkham Knight on PlayStation 4 yesterday evening and caught enough super-criminals to trigger the partial Knightfall Protocol ending. I thoroughly enjoyed the game except when it forced me to use the Batmobile, which I found extremely frustrating at times. I may return to collect everything I need to trigger the full Knightfall Protocol ending at some point, but that will have to wait until after I have whittled down my ever-growing list of games to play!