It is considered axiomatic among gamers that a game that's good when it's new is always good - if it doesn't have staying power, it just wasn't that amazing in the first place. There's a few games that, years after their release, we're still playing - games like Tetris, Sid Meier's Alpha Centauri, the original Quake, or for that matter Asteroids. Each genre has at least one game that fits this description. In the space flight simulator category there are really three games which stand out significantly: Tie Fighter, which was really the first truly-3D spaceflight sim with believable capital ships; Wing Commander, various versions of which (especially Privateer) are still being played avidly; and Descent: Freespace along with Freespace 2, two titles from Volition that years later are still the benchmark for such games. The list would also not be complete without Elite, which is arguably the game that really defined the genre to begin with.