Bioshock 2 is a game published by 2K Games in 2010. It is a sequel to the original Bioshock, and takes place approximately 8 years since the end of the first game. You play as Subject Delta, a Big Daddy prototype, revisiting the familiar city of Rapture.
Bioshock is a game developed by Irrational Games, first released in 2007 and re-released recently, as a remastered edition. Both the original and remastered version are available on Steam now for $19.99.