April 23, 2009: An advertisement in PlayStation Home revealed that PS3 owners will be receiving a downloadable content pack for Batman Arkham Asylum that lets them play as The Joker. Batman remains the main character in the single-player portion of the game, while the iconic villain will be playable in exclusive challenge maps.Kotaku: Play As The Joker In Arkham Asylum PS3 April 23, 2009)

Eidos has confirmed that the PS3-exclusive DLC pack will be available free of charge.Joystiq: Batman: Arkham Asylum Joker DLC will be free June 1, 2009)

The Challenge Mode in Batman Arkham Asylum serves as a robust substitute to the game's absence of multiplayer. Story is left behind and Batman is given the opportunity to just bust some skulls. Each map has a different theme and the player will be given different objectives to accomplish. For example, in the Silent Knight Challenge Mode, Batman has to take out thugs using the Batarang, his glide kick attack and using stealth. Challenge Mode gives players the opportunity to hone their combat skills, familiarize themselves with the game's mechanics or just get in some quick fights for fun.Spike: Batman: Arkham Asylum - Silent Knight Challenge Mode (Time: 6:22)