The Elder Scrolls IV: Oblivion / Elder Scrolls 4 for Windows

In keeping with the Elder Scrolls tradition, players will have the option to experience the main quest at their own pace, and there will be plenty of opportunities to explore the vast world and make your own way. Numerous factions can be joined, such as the thieves or mages guilds, and each contains its own complete storyline and the chance to rise to the head of the faction and reap further rewards. Oblivion features a groundbreaking new AI system, called Radiant AI, which gives non-player characters the ability to make their own choices based on the world around them. They'll decide where to eat or who to talk to and what they'll say. They'll sleep, go to church, and even steal items, all based on their individual characteristics. Full facial animations and lip-synching, combined with full speech for all dialog, allows NPCs to come to life like never before.