Age of Empires II: The Age of Kings - Official Scenario Design Toolkit by Paul Schuytema
This is the definitive, official guide to creating original, world-class Age II maps, scenarios, and campaigns using the game's built-in Map Editor. With more than a million copies of the game already sold, this one-of-a-kind book is sure to find an enormous audience. Written by a team of professional game developers, it also features a fully loaded CD complete with maps, templates, example files, and utilities.