Castle of the Mad Archmage Illustration Book (2014)

From the publisher's website:

The free serialized version from several years ago has been added to, scrubbed, edited, and generally improved upon. The adventure now is self-contained, from the surface ruins to the dreaded lowest levels, with a separate map book and illustration book (with pictures to show the players what they see at given places in the dungeons).

User note:

This megadungeon requires three books: Castle of the Mad Archmage Adventure Book, Castle of the Mad Archmage Map Book, and Castle of the Mad Archmage Illustration Book.