"Borderlands" received favourable reviews upon its release, and sold over two million units by the end of 2009. Its success spawned four DLCs—"The Zombie Island of Dr. Ned" in November 2009, "Mad Moxxi's Underdome Riot" in December 2009, "The Secret Armory of General Knoxx" in February 2010, and "Claptrap's New Robot Revolution" in September 2010—and three follow-ups, "Borderlands 2" in September 2012, "" (interquel) in October 2014, and "Borderlands 3" in September 2019. A remastered version for Microsoft Windows, PlayStation 4 and Xbox One— was released on April 3, 2019, which features graphical enhancements, and gameplay improvements backported from "Borderlands 2". A version for the Nintendo Switch was released alongside "Borderlands 2" and "Borderlands: The Pre-Sequel" in the "Borderlands Legendary Collection" for release in May 2020.