Alright, I want to know how many people have played this game, because it's probably my absolute favorite computer game, and I think it's criminally underrated.
The premise: You pilot a ship through a series of mines, fighting the mining robots which have gone berserk. The hook is, you've got 6 degrees of freedom in movement. You can slide up/down, left/right, forward/back, roll, pitch and yaw. You aren't tied to the floor like in a FPS, you can move any damn way you please. What that means is that your first play through would likely result in you being upside down in a passage, wondering which way is up, and feeling a little bit of vertigo. Once you adjusted to it, though, Descent offered a remarkably unique experience. Large rooms produced anxiety attacks, since bots could attack you from any side. When it got too quite, you'd constantly be checking your back for the nasty shredder bot, who could sneak up behind you and suddenly slice up half your shields. And then there were the bosses. Fighting that big sucker up there on the left was sheer terror. Fighting in a room where a dodge in the wrong direction meant a face-full of lava, this beast could teleport around the room, going invisible only to pop up behind you a second later and unload a bunch of homing Smart Missiles. Descent was challenging, unique, and an absolute blast to play.
Even better than the single-player, though, was the multi-player. The game let you play through the campaign cooperatively, or you could opt for a free-for-all melee. Dogfights with other players were fast and furious, each player making full use of that freedom of movement, all the while trying desperately to target the other player. Also, in what other game can you sit upside-down on the ceiling, just waiting for your unsuspecting prey to fly cluelessly into the room so you can sweep down and destroy him?
If you've never played it, it's well worth trying out. I still whip it out every now and again, and graphics aside it still holds up great. There really haven't been any other games since (other than its 2 sequels) which use the same movement system, so it's still a fresh, unique experience, despite being almost 20 years old. I love it, poured hours into it when I was younger, and think it's one of the underrated classics of the shooter genre.