As with the original version of the game, STAR WARS: KNIGHTS OF THE OLD REPUBLIC II: THE SITH LORDS thrusts players into a plotline thick with twists and turns and many choices. Some of these choices lead to the "light," or good side of the force, whereas others lead down the dark path -- toward anger and ultimately evil. As the last of the Jedi knights, the player is hunted by the evil Sith, who wish to turn the player to their side or, if that fails, kill him. Along the way, the player will meet many computer-controlled characters, some who will become allies, and others who will become enemies.
The player frequently makes decisions through a text-based dialog system: Computer characters will "speak" to the player, and the player then chooses from a list of pre-determined options to reply. Based on the reply, the player can become either more "light" or "dark" -- help people or kill them, rescue or enslave, fight for those less powerful or dominate the weak, and so on.