The Granddaddy of All Dungeons Returns!
Rappan Athuk, the legendary mega-dungeon by Frog God Games and Necromancer Games is nothing more and nothing less than a good, old–fashioned, First Edition dungeon crawl updated for the Pathfinder Roleplaying Game. Very difficult, Rappan Athuk will truly strike fear into the hearts of the most stalwart adventurers. It offers legions of inventive traps, tricks, strange features, and monsters—many of them never before seen. It affords numerous opportunities for roleplaying, but anyone willing to brave these subterranean halls better arrive ready to rumble, or their lives will be short indeed. Many, many players have lost favored PCs delving into the depths of this dungeon, all the while giggling like children and having the time of their lives. Hundreds, if not thousands of players have combed the halls of Rappan Athuk over the years, seeking treasure and fame, making it one of the best-known dungeon locations the game has ever produced. Even players who have never entered its halls know the term: “Don’t go down the Well!”
Also available for S&W and broken into multiple adventures. Also see https://paizo.com/store/byCompany/f/frogGodGames/pathfinderRPG/rappanAthuk for expansions for this product.
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podcast_genius has played this adventure and would not recommend it.
Great as a resource to pick pieces out of. As a Pathfinder adventure - it is just far too deadly for my group. Half your time would be spent creating characters. Definitely requires some work on the DM too to create meaningful hooks and motivation for the players.
Check out the expansion too - I am a fan of the low-level castle as a stand-alone adventure for newer players. If a sandbox-mega-dungeon is what you are looking for, I must recommend The Lost City of Barakus, Tomb of Abysthor, and The Vault of Larin Karr far ahead of this one.