Return to the underwater city of Rapture in Bioshock 2 ($60). Set eight years after the events of the original, Bioshock 2 keeps the first-person shooter mixed with RPG elements design of the original, but has players fill the shoes of an amnesia-suffering Big Daddy as he searches the city for his lost Little Sister. As thought-provoking as it is immersive, the game offers a great mix of action and substance, something that's relatively rare in most FPS-style games.