Gearbox Software's second mini-expansion for their hit shooter Borderlands is now finally available for the PC over a week after it was made available for Xbox 360 users. Mad Moxxi's Underdome Riot can now be purchased and downloaded for $9.99 over at Gearbox's online store. Steam users can also purchase and download the game.

This second DLC release adds three new Riot Mode arenas to the game as players will have to fend off waves of the game's most dangerous enemies. It also adds a new bank feature that allows for more storage of items and lets characters have two more quest points for rewards.