Oblivion
Prepare to experience the cutting-edge artificial intelligence, the stunning visuals and intense storyline that have made the Elder Scrolls series a legend. In Knights of the Nine, help this long-disbanded group of heroes reclaim their former glory as they travel through the territories of Cyrodill. In Shivering Isles, you'll explore the new realm of Sheogorath, and battle in a world divided into Dementia and Mania amongst the hideous denizens of the islands. Choose from a variety of races and classes to create your own individual character. The Elder Scrolls IV: Oblivion features over 1,000 non-player characters that eat, sleep, and complete their own objectives. You can explore an open-ended environment completing quests and eventually ridding the world of the marauding demons.
Bioshock
You are the only survivor in a North Atlantic plane crash, floating in the icy water as the fuselage sinks beneath you. Your only hope is a lighthouse in the distance, inside of which sits a submersible capsule. You climb in and you begin your decent into Rapture, a city hidden beneath the sea. BioShock is the "genetically enhanced" first person shooter that lets you do things never before possible in the genre: turn everything into a weapon, biologically mod your body with plasmids, hack devices and systems, upgrade your weapons and craft new ammo variants, and experiment with different battle techniques. No encounter ever plays out the same, and no two gamers will play the game the same way.