Duke Assault is a shovelware expansion pack released in 1997 by International Software Values Inc. for Duke Nukem 3D. It contains 1500 usermaps, approximately 100 of which being multiplayer, that were collected from BBSes and the Internet, and a level loading front-end.
Most of the maps have been criticized for their poor quality. In fact, it includes even "troll maps" that instantly kill the player and very basic maps made for teaching.
