Good news for those of you who own the fantastic Batman: Arkham Asylum (reviewed here) as later today the first of two free downloadable content packs will be available on PS3, Xbox 360 and PC.

Today's pack is titled Insane Night and will include two challenge maps for players to test their skills. Totally Insane will focus on players' combat skills by stopping waves of inmates who are trying to escape from Arkham via the asylum's records room. The second map, Nocturnal Predator, will focus on stealth skills by having to eliminate a horde of enemies without being detected.

The second pack, titled Prey in the Darkness, is scheduled for release on the 24th October.