SPACE OPERAS (sort of..)
This zip file includes two levels. Starzone .map and its
sequel Skyline.map Skyline is loads better but Starzone 
is still good.

Description: Starzone: A space-mining station built into 
a small moon. Lots of lighting effects.
Skyline: A large Spaceport invaded by aliens. It has huge 
spaceships docking outside and some nice no-gravity bits.
You can even fire off the cannon in one ship!
   
Single player: Yes
Dukematch: Yes
Co-op: Yes(Starzone) and no(skyline)
Bugs: None really. Perhaps a few problems with the enemy
count on Starzone. And donīt take the two-way train on 
Skyline more than four times... 
Difficulty settings: Yes(Starzone) and no(skyline).
Author: J. Christian Jensen