The free Batman: Arkham Asylum DLC adds two new Challenge maps, as I’ve already told you, and you can play them as soon as you get them. It’s a really nice gift from the developers of one of the best selling games of the year (and with a bit of luck, of all times), who got the number one position in the Steam sales report.
Also remember to check back soon for a complete Batman: Arkham Asylum review here in the Unigamesity.