From publisher blurb:
The first fourteen levels were only the beginning!
Confound your players with a whole new level to add to your Castle of the Mad Archmage™ adventure. Level Four South describes the wonders of the mysterious Gardens beneath the ruined castle. A variety of different garden areas are described, including the rock garden, the butterfly garden, and the herb garden. Also within the Gardens are the mysterious tower at the center of it all, plus the raucous and dangerous giants’ tavern, which exists in a multitude of different dimensions, and which can be easily worked into any campaign setting.
This module features 22 new encounter areas and 8 new monsters, a full page map, plus new magic items, new rumors, an explanation of how this module fits into the whole Castle structure, and the impact it will have on the inhabitants of the central fourth level of the dungeon. There are also tips for game masters who would like to run this level as a stand-alone adventure.
Levels in the dungeon roughly comport to suitable character levels, to this module is best suited for PCs of approximately 4th level. However, there are (intentionally) some encounters that only more powerful characters can expect to handle.