"Star Wars Jedi Knight: Mysteries of the Sith is an expansion pack for the first person shooter Star Wars Jedi Knight: Dark Forces II. It was developed and published by LucasArts, and released on January 31, 1998. The expansion includes a single-player mode and fifteen multiplayer maps. The multiplayer mode allows up to eight players to play online or over a network. It was re-released onto Steam along with its predecessors and sequels.
The single-player story is set five years after the events of Dark Forces II. The player controls Kyle Katarn, protagonist of Dark Forces II, and later in the game, Mara Jade, one of the most popular Star Wars Expanded Universe characters.
There are also technical improvements over Dark Forces II, including colored lighting, new textures and models, and improved artificial intelligence. Mysteries of the Sith received mostly positive reviews from critics, with praise being given to the game's story and improvements to artificial intelligence."
Source: Wikipedia, "Star_Wars_Jedi_Knight:_Mysteries_of_the_Sith," available under the CC-BY-SA License.