Powerslave (also known as "Exhumed") is a FPS built using the Build engine (an earlier version of the engine used to create Duke Nukem 3D). This demo version displays its distinct Egyptian theme and because it uses the Build engine it plays reasonably well. The graphics and sounds are decent, but it seems to be lacking a bit of the ineffable quality that made Duke so great. (Well, besides the immorality). It plays decently well so if you enjoy 3D shooting games this might be one to try.