Trivia
While it would later become a standard matter of course that companies would form solely to sell new level packs to iD Software's first-person shooters, a couple of enterprising individuals led the vanguard as early as Duke Nukem 1, before there was the same calibre of groundbreaking excellence to co-opt. One Tony Kamin of Green Bay, WI seems to have reverse-engineered the DN map format and gotten a level editor together as early as 1992, shopping around two alternate level sets under the name "Duke Nukem Extension Set" for only five dollars' registration a piece. It would look like a coincidental case of parallel evolution when Larry Shanker of Salem, OH began selling his map pack, "Duke's Next Adventure", the following year for the same price... but suspiciously much of the legal boilerplate and installation instructions in their respective README.TXT files are identical! There's no word on the record as to how Apogee responded to these cats turning a quick buck off of their product.
Imitation is the sincerest form of flattery! Keen-eyed gaming enthusiasts might notice through the first Duke Nukem series occasional level sprites as having been adapted or lifted wholesale without credit from PC ports of Megaman and Turrican.
