As the name suggests, you'll primarily play as Batman in Batman: Arkham Asylum, but PlayStation 3 owners get an added bonus: The Joker, who is a free exclusive character for PlayStation Network members with an Internet connection. Unfortunately, you can't use him in the main campaign; you can only play as the Joker on specific challenge maps.
Adding the Joker to the Game
On your PlayStation 3, load up the PlayStation Store and search for "Batman: Arkham Asylum." In the list of add-ons is Play as the Joker Challenge Map, available at no additional cost. After the add-on finishes downloading and installing, you can load the game to the main menu.
Picking One of Several Exclusive Challenge Maps
When selecting a challenge map after installing the Joker add-on, you might notice the list of maps has increased significantly; there are now eight additional maps featuring scenarios only appropriate for the crazy clown, such as Paging Dr. Joker and Giggles in the Garden. You can only play as Joker on these eight maps.
Adapting to the Kooky Clown's Fighting Style
Naturally, Joker doesn't have access to Batman's toys, so he has to stick to his own maniacal inventions. When manipulating guards, press Left on the D-Pad to release some chattering teeth -- a fine trick to distract a potential victim-to-be.
Pressing Right reveals glasses that function similar to Detective Mode, scanning the room for guard locations.
Finally, press Up to access the gun. It will instantly take out any guard that Joker shoots, but you'll only get one bullet per round so make it count.
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