
This add-on introduces the Dem Bones Challenge Map to Batman: Arkham Asylum.
Following the Joker's attack on Gotham City Hall, he is apprehended by Batman and transported to Arkham Asylum, where several members of the Joker's gang are temporarily held after a fire at Blackgate Prison. Thinking the Joker intentionally let himself be caught, Batman enters the asylum with him. The Joker's scheme unfolds when Harley Quinn seizes control of the security systems, allowing the Joker to flee the facility with the help of a corrupt guard who abducts Commissioner Gordon. The Joker warns that bombs placed throughout Gotham will detonate if anyone enters Arkham, compelling Batman to act alone. Pursuing Quinn to the medical wing to save Gordon, Batman is exposed to Scarecrow's fear toxin and experiences terrifying hallucinations, including visions of Gordon's death and the ghosts of his parents speaking to him. After defeating Scarecrow, Batman captures Quinn and rescues Gordon. The Joker then leads Batman to Bane, who has been held and experimented on by Arkham doctor Penelope Young. The Joker releases Bane, and Batman is forced to battle him as Quinn makes her escape. After the fight, Batman retreats to a hidden Batcave installation on the island to replenish his equipment.
| PS3 | May 11, 2009 |
| PC | May 11, 2009 |
| Mac | May 11, 2009 |
| X360 | August 20, 2009 |