2K Games has announced that Mad Moxxi's Underdome Riot, the second game add-on content developed by Gearbox Software for Borderlands, is now available on the Xbox LIVE Marketplace for the Xbox 360 for 800 Microsoft Points. Mad Moxxi's Underdome Riot will be available for the PlayStation Network beginning January 7th, 2010 for $9.99 and Windows PC in early 2010.

Mad Moxxi's Underdome Riot presents fans with new gameplay features that expand upon the popular Borderlands video game in dangerous and exciting ways. The all-new Riot Mode challenges players to test their weaponry against hordes of menacing antagonists, thirsting for carnage in tournaments where the rules of warfare are constantly changing. Mad Moxxi's Underdome Riot also offers several new game features, including the ability to earn two more skill points making player's characters an even deadlier lethal weapon, and an all-new bank feature that provides extra storage capacity for weapons of devastation.

Complete with extensive co-op integration seamlessly blending the single-player and multiplayer experiences, Mad Moxxi's Underdome Riot allows players to freely join or leave each other's games at any time for collaborative mayhem or the freedom to enjoy the game in full single-player mode. It also includes the groundbreaking weapon generation system that offers more than 16 million weapons from which to choose.