If it won't launch on your Steam Deck, many users found success by switching to Proton 7-29 in the game's properties.
Are you stuck on a or trying to find a particular Riddler trophy right now? batman-arkham-asylum
In combat, a knocked-down enemy isn't out of the fight until you perform a Crouch + Takedown (Shift + Right Click on PC). It’s risky because it leaves you vulnerable, but it instantly K.O.s a downed baddie. If it won't launch on your Steam Deck,