World's Largest Dungeon

The World's Largest Dungeon is a 800+ page D&D adventure set entirely in a dungeon. The players can't leave the dungeon the way they entered (one way wall of force effect), so all supplies must be taken into the dungeon with them. The campaign is designed to take four to six characters from first level to 20th (and beyond!) over the course of two real-time years and at least a year of game time. In their exploration they will encounter every monster in the monster manual (as well as a few new ones), although it is rumored that the balor was mistakenly left out.