From publisher blurb:
The legendary megadungeon is here at last, now for the Pathfinder Roleplaying Game!
More than thirteen levels and over 1,500 keyed encounters of perils, monsters, traps, and treasure to bedevil your players. Find levels of warring humanoids, the deadly Arena, ancient artifacts, lost temples, portals to other worlds, and the ultimate secret of the dungeons... the Mad Archmage himself.
Originally released as a free electronic book in serial format, the Castle of the Mad Archmage has been completely revised, expanded, and updated. It is a complete adventuring environment, from the surface ruins to the deepest caves and caverns.
You and your players could literally spend years exploring the dungeons beneath the Castle and still not discover everything. It can accomodate characters from first to fifteenth experience level and beyond.
This version of the Castle of the Mad Archmage is compatible with the Pathfinder Roleplaying Game.
Note: You must also purchase the Map Book and the Illustration Book in order to run this adventure.