Descent was quite popular on its release. It expanded on the 3D shooting genre by giving players a real 3D environment unlike Doom or Duke Nukem 3D. In this 7-level DEMO version of Descent you must pilot your spaceship through many 3D levels destroying various bad guys along the way. Think of Doom crossed with Wing Commander and you'll have a fairly good picture of what this game's about. A fun shooter that has aged pretty well (and still works on my XP computer) that lacks a bit of the flair and style of Doom or Duke Nukem 3D.