The game is powered by the same version of the Quake III engine used in its predecessor, Jedi Outcast, containing modifications to the Quake code to give a third-person view and new lightsaber effects.(Jedi Knight II had these 3rd person effects as well). Players have the ability to construct their own lightsaber by choosing the hilt style and blade color. After completing certain objectives, new saber styles become available including the ability to wield two independent sabers.
Players take the role of Jaden Korr, a new student recently arriving at Luke Skywalker's Jedi Academy on Yavin IV. Jaden, along with fellow initiate Rosh Penin, becomes an apprentice to Kyle Katarn (the protagonist of Jedi Knight) at the beginning of the game. As a Jedi Apprentice, the player is dispatched to accompany Kyle on various peace-keeping missions across the galaxy, many of which involve battling an emerging Sith cult known as the Disciples of Ragnos who are stealing Force energy from Force-rich locations across the galaxy.

(source Wikipedia)