Borderlands : Mad Moxxi's Underdome Riot

In order to activate this game, you will require a third-party 'Steam' account. For full details on how to activate please follow this link: https://support.steampowered.com/kb_article.php?ref=5414-TFBN-1352

*This content requires the base game Borderlands on Steam in order to play.*

Mad Moxxi's Underdome Riot is an addon pack for Borderlands that includes a new cooperative arena game mode and a stash to store your gear. 
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