I remember when Descent came out back in 1995. Among a flurry of Doom clones, it instantly stood out from the pack by showing everyone what a truly 3d game can be. It takes the classic FPS concept of collecting keys and fighting bosses to reach an exit, then twists it into something Escher would be proud of. For the first time you actually had to think in three dimensions and the freedom this gave you was exhilarating, once you got the hang of it. While the graphics are dated, the gameplay is timeless and definitely worth checking out again, or for the first time if you missed out on this unique spectacle in PC gaming history.