Mastering the art form.
While Wolfenstein 3-D is a simplistic game by today's standards, and creating levels for it is technically very easy, there's a certain magic to it. Like any great art form, it requires a certain touch — learned only through repeated trial, error and experimentation — to create a true masterpiece. In this section, I'll reveal some of the secrets, guidelines and ideas I've lived by during the course of my thirteen years of level design experience.
The Wolfenstein map-maker's bible: MAPTIPS.TXT
Every budding level designer should start in the same place I did: By reading "Tips for Creating/Editing Wolf3D & Spear of Destiny Designs," by Warren Buss. It's a simple guide to mapmaking, explaining the core basics, telling you what to watch out for, and providing a solid foundation of knowledge. Due to its importance, I've archived this document here.
B.J. Rowan's Level Design Guidelines
I'll be posting fresh content here in a short while.