Force unleashed.

Force unnleashed was a game made by lucas arts, the game used phsics which were one of the game's main themes. You play as Darth Vaders secret apprentice, you go to several places in the game, which their is a variety, further into the story, the secret apprentice questions his loyalties. In my opinion, it is a good story, the story is set between movies three and four, it explains many things.