Just above the locked door to Arkham North in the passageway between the two areas, pull down the weakened wall up high with your Ultra Batclaw and grapple up for a Riddler Trophy. In Arkham West, ...

Can you free roam in the game weither it be when you've completed it or not? Yes -- there's no "point of no return" so you can explore the Asylum freely to gather Riddles before or after the final ...