Comprising 22 sub-levels and approximately 930 keyed locations.

+---------------------------------------------+ | CITY OF LONGFELT | <- The Campaign Hub +---------------------------------------------+ | (Ganfal Swamp) v +---------------------------------------------+ | LEVELS 1-4: THE UPPER DELVE | <- Goblins, Kobolds, & | (Multiple Entrances / Outposts) | Faction Warfare +---------------------------------------------+ | v +---------------------------------------------+ | LEVELS 5-7: THE WIZARD'S LAB | <- Sethid's Experiments & | (Plus Floating Demi-Plane Level) | Planar Affinities +---------------------------------------------+ | v +---------------------------------------------+ | LEVELS 8-10: THE DEEP TOMBS | <- Arch-Liches, Cultists, | (The Ancient Core) | & End-Game Threats +---------------------------------------------+ Key Features of the Gunderholfen PDF

The dungeon’s history is layered, reflecting its long transformation. Originally a dwarven fortress, it later became the prison of a tyrant where inmates were forced to excavate their own cells. Following the tyrant’s fall, various factions—including warring prison gangs, cultists, and goblinoids—claimed different levels. Gunderholfen - G. Hawkins - DriveThruRPG

The Gunderholfen PDF layout is intentionally designed to evoke the sparse, highly gameable aesthetics of early TSR modules. : Features 10 main dungeon levels.