Subspace is a top-down 2d shooter. Players may choose from eight different ships with varying specalties. There are many different game modes including chaos, capture the flag, powerball, and league play. The game is capable of hosting hundreds of players in a single zone, and is often thought of as one of the first massively multiplayer games.
In 2007, a modified client designed to be more secure against game hacks called Continuum was released. It can be downloaded at http://www.getcontinuum.com/ for free.