The Elder Scrolls IV: Oblivion

Like earlier games in the Elder Scrolls line, Oblivion is designed to present a living fantasy world that gamers experience on their own terms. The game is populated with over 1,000 NPCs, each leading a full life, following regular schedules according to their individual wants, needs, and positions. Players are encouraged to interact in the world as they choose, as noble heroes, greedy villains, or anything in between. The game's main story is designed to conform to characters of any moral bent, and plenty of side-missions provide extra adventuring for all.