The ground-breaking introductory adventure for Dungeons & Dragons that served as a DM aid in the first D&D Basic Set, released by TSR in 1977. This set included a 48-page rulebook covering the first three levels of play, and was skillfully edited by Dr. J. Eric Holmes from the original 1974 D&D rules written by Gary Gygax and Dave Arneson. The original set included an exemplary dungeon level, but it was a loose collection of examples and not geared toward starting characters. Holmes advanced this concept by writing a new thematic dungeon with a strong backstory, creating an adventure that has remained a fan favorite over the decades. Officially, its only title is "Sample Dungeon" but colloquially it goes by various names based on Zenopus, the doomed wizard who built the dungeon under his tower