BioShock Infinite: Burial at Sea is an episodic expansion to the first-person shooter video game BioShock Infinite, and a prequel to the original BioShock. It was developed by Irrational Games, and published by 2K Games. It is available on Linux, Microsoft Windows, PlayStation 3, Xbox 360, and OS X. Burial at Sea consists of two episodes. Episode 1 was released worldwide via download-only on November 12, 2013, and Episode 2 was released on March 25, 2014. A retail version for PlayStation 3 and Xbox 360 was released on November 4, 2014 as part of BioShock Infinite: The Complete Edition.