Mad Moxxi's Underdome Riot

Mad Moxxi's Underdome Riot is the second downloadable content pack for Borderlands. The release date will be 29 December 2009 for the Xbox 360 and 7 January 2010 for the PS3, with no word on the PC release date.

Features

 * Three new Riot Arenas
 * Bank to store items
 * Two additional skill points as mission rewards
 * New game mode
 * "Think ODST's 'Firefight' or Gears of War's 'Horde Mode.' Cash, prizes and competition! It's like Smash TV in coop FPS, but in the Borderlands."

Plot
Few details have been released about the plot, but the gameplay will include three new Riot Mode arenas where players will fight AI-controlled enemies (PvE) in singleplayer or multiplayer. The expansion features only one mission entitled "Prove Yourself" in which the player must complete all three arenas.

Areas

 * Hell-Burbia
 * The Angelic Ruins
 * The Gully

Achievements
The trophy list from a PS3 update reveals the following new achievements, probably associated with the new DLC.
 * Small Tournament Completed the lesser challenge in all 3 coliseums
 * Hell-Burbia Completed the larger challenge in the Hell-Burbia coliseum
 * The Angelic Ruins Completed the larger challenge in The Angelic Ruins coliseum
 * The Gully Completed the larger challenge in The Gully coliseum
 * Big Tournament Completed each of the larger challenges in all 3 coliseums

Trivia

 * The title "Mad Moxxi's Underdome Riot" is highly likely to be a reference to "Mad Max: Beyond Thunderdome".
 * In the picture with the tuxedo-styled Claptrap you can see at the bottom of the ramp a bounty board which means many more missions to come in the DLC