DescentDescent is a first person shooter (FPS) game developed by Parallax Software and released by Interplay Productions in 1995 for MS DOS, and later for Macintosh, PlayStation, and RISC OS. It popularized a subgenre of FPS games employing six degrees of freedom and was the first FPS to feature entirely true 3D graphics. The player is cast as a mercenary hired to eliminate the threat of a mysterious extraterrestrial computer virus infecting off world mining