Bioshock

Set in 1960, the game puts the player in the role of a plane crash survivor named Jack, who must explore the underwater city of Rapture, and survive attacks by the mutated beings and mechanical drones that populate it. The game incorporates elements found in role-playing and survival games, and is described by the developers and Levine as a "spiritual successor" to their previous titles in the System Shock series.....The game received overwhelmingly positive reviews, including praise for its "morality-based" storyline, immersive environment and its unique setting, inspired by Objectivist philosophy and rhetoric.

CPU: Pentium 4 2.4GHz Single Core processor
System RAM: 1GB
Video Card: D 128MB RAM (NVIDIA 6600 or better/ATI X1300 or better, excluding ATI X1550).
Sound Card: 100% direct X 9.0c compatible sound card
Hard disc space: 8GB free space