Free downloadable content for Eidos' smash Batman: Arkham Asylum is on the way today, and we're told the new content will be hitting the PS3, and on September 17th.

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We're not sure exactly what the new content will comprise, but one site is rumouring that it'll be the Insane Night pack. This is said to include the Dem Bones Scarecrow Challenge and Crime Alley Challenge Map Packs previously offered in pre-order deals stateside.

Another pack, called Prey in the Darkness, is said to be arriving on the 24th of September, but it is suggested that this new offering could be a exclusive.

Batman: Arkham Asylum is widely regarded as a one of the best superhero games ever released, and it is certainly the top title yet to hit shelves. We'll have more for you on this very soon.

By Luke Guttridge