Batman: Arkham Asylum Challenge Room Walkthrough Video is now available in an extended version to show off one of the many Challenge Rooms in the full length version of the game. Presented at GDC 09 and narrated by Join Sefton Hill, Game Director at Rocksteady, the trailer can be found here. Word is:

"Join Sefton Hill, Game Director at Rocksteady in this extended video as he guides you through one of the Challenge Modes from Batman: Arkham Asylum showing off the Invisible Predator gameplay moves. Learn to propel yourself into the shadows, take out enemies with pre-planned explosive attacks and finish them off with a devastating glide kick."