Eidos Interactive announces a Batman: Arkham Asylum demo will be released on Friday for Windows, Xbox 360, and PlayStation 3, also revealing what to expect from the sample of the superhero game:

Monday 3rd August/...The consumer demo for Batman: Arkham Asylum™, published in the United Kingdom by Eidos Interactive, will be available for the Xbox 360® video game and entertainment system from Microsoft, PLAYSTATION®3 entertainment system and Games For Windows® LIVE worldwide on August 7. The full game will be available at retail stores nationwide in the United Kingdom beginning August 28th.

The demo will be offered on Xbox LIVE® Marketplace for Xbox 360 and PlayStation®Network for the PLAYSTATION 3. Fans can visit www.batmanarkhamasylum.com for details on how to download the Games For Windows LIVE version.

The Batman: Arkham Asylum™ demo opens as the DARK KNIGHT and COMMISSIONER GORDON return The Joker back into confinement at ARKHAM ASYLUM. But things soon fall apart as THE JOKER gains the upper hand and springs a trap, setting Arkham Asylum’s occupants upon Batman. The demo offers gamers a taste of the fierce FreeFlow™ combat system, the cunning stealth of the Invisible Predator™ mechanic, and the feeling of becoming the WORLD’S GREATEST DETECTIVE as they navigate Arkham Asylum’s imposing Intensive Treatment facility. Players can unlock character bios, as well as get a sneak peak at some of the infamous foes that BATMAN will encounter within the cavernous and macabre confines of Arkham Asylum.

Featuring amazing graphics within an intense, immersive setting, Batman: Arkham Asylum™ exposes players to a unique, dark and atmospheric adventure that takes them to the depths of Arkham Asylum – Gotham City's psychiatric hospital for the criminally insane. Gamers will move in the shadows, instigate fear amongst their enemies, and confront The Joker and Gotham City's most notorious villains, including Harley Quinn, Bane, Killer Croc and Poison Ivy, and the newly revealed Scarecrow, who have taken over the asylum.