Borderlands: Mad Moxxi's Underdome Riot

Mad Moxxi's Underdome Riot is the second downloadable content (DLC) for Borderlands.

This time, set in the chaotic mess known as the Underdome Riot. The player can either go solo or team up with three friends and compete in a series of tournaments in three different arenas (Hell-Burbia, the Angelic Ruins, and the Gully) with enemies ranging from normal enemies from the game to boss characters. There are two tournaments for each coliseum and each with their own degree of difficulty and wave strength, ranging up to 20 waves of enemies for the largest tournament.

The new feature of the game is the bank in which the player can off load weapons they want to save for later, starting out with 12 inventory slots and is upgradable to 42 slots. However there are no other changes to the game including the skill cap which is set at 50.