This is a fan made Saturn port of Tomb Raider’s Unfinished Business expansion released only on PC back in 1998.
The first chapter takes place in Egypt, and occurs several months after the events of Tomb Raider. Lara returns to the city of Khamoon, where she must investigate a hidden temple dedicated to the feline goddess Bast. The second chapter is a prequel to the first, and continues directly the events of the original game, starting with Lara sliding down the slope of the last level, preparing to deal with the remnants of the Atlantean race.