"In Search of the Unknown" was an introductory scenario intended to teach Dungeon Masters (DMs) how to create dungeons. Mike Carr intended it for use as an instructional adventure for new players. The module is a beginner's scenario, which allows the DM to add monsters and treasure. The module is coded B1 because it was created as the first adventure for the "Dungeons & Dragons" "Basic Set", though it is possible to convert it to "Advanced Dungons & Dragons". The adventure is designed for characters of first to third level, and was written for DMs and players with little or no gaming experience. Interior art was by David C. Sutherland III, while Sutherland and David A. Trampier did the cover of the original monochrome edition. The updated 1981 edition featured front and back cover art by Darlene Pekul.