Borderlands 2 is a space western first-person role-playing shooter video game that was developed by Gearbox Software and published by 2K Games. It is the sequel to 2009's Borderlands and was released for the Microsoft Windows, PlayStation 3 and Xbox 360 platforms. As with the first game, Borderlands 2 players complete a campaign consisting of central quests and optional side-missions as one of four vault hunters on the planet Pandora. Key gameplay features from the original game, such as online collaborative campaign gameplay; randomly generated loot, such as weapons and shields; and the character-building elements commonly found in role-playing video games are found in Borderlands 2. The game was released to critical acclaim on September 18, 2012. Downloadable content for the game has also been released subsequently.