Shadow Warrior is an internal 3D Realms game using many of the same team members that brought you Duke Nukem 3D as well as long time staffers Frank Maddin & Jim Norwood.
Shadow Warrior is built upon the successful Build engine, that brought you Duke Nukem 3D. We have added some interesting things like:

True room over room situations where you can have beams running over a room and be above, below, or stand on the beam. Ledges, true bridges and more are all possible, adding to the realism of the environment.
8 player network and 2 player modem supported, featuring deathmatch and co-operative play.
Fog effects
Colored lighting
SVGA mode support.
Transparent water that you can see into and out of, as well as swim in.

• Use huge 3D rotating gun turrets to mow down opponents. Some turrets are on things like battleships, while some are simply set into a wall, or other structure.

• Swim, duck, jump, drive vehicles, climb ladders and more in this intense action game.

• Visit realistic places and settings in the game like an airport where a plane has crashed, construction sites and more, not just dark, dreary, faceless dungeons.

• Intense interaction with your environment in which you can blow up nearly every object, or interact with it in some way.

• Use vehicles to smash down some game walls, or destroy a section of a map.

• Drive vehicles which have weapons from machine guns to lasers, or rockets. Get into some vehicles and go under others. You will drive things like boats, tanks, personnel carriers, forklifts, bulldozers and more. You can run over enemies, or shoot them. The choice is up to you!

• Pentium 66Mhz or better
• 16Mb of memory
• 60MB available HD space
• CD-ROM drive (for registered version)
• 100% Sound Blaster compatible sound card
• VGA 256 color or better
• Optional: Keyboard, Mouse, Joystick
• DOS v6.2 or higher