Greyhawk Grognard: Castle of the Mad Archmage Final Release Now Available!
Joe "Greyhawk Grognard" Bloch presents his vision of the ruins of Zagyg's castle. His version of the dungeon is unofficial, but if you've made use of one of the published versions of the dungeon, you can easily tweak some things and place this elsewhere in the campaign as an alternate megadungeon.
An epic role-playing adventure suitable for use with various role-playing systems, including Advanced Dungeons and Dragons™, HackMaster™, Castles and Crusades™, Labyrinth Lord™, Swords & Wizardry™, OSRIC™, etc. Explore the crumbling dungeons beneath the castle of the mad archmage, deal with deadly traps, fight hungry monsters, and win fabulous treasures!
Easily converts to Classic D&D on the fly, and should present a lengthy adventure spanning many game sessions. Check it out.