Published by Wizards of the Coast.
Worst. Module. Ever.
I try very hard not to be hyperbolic on this blog; I know I often don’t succeed. But I am hard pressed to think of any module published under the Dungeons & Dragons banner that was worse than 1988’s Castle Greyhawk. Consider: Gary Gygax’s legendary Castle Greyhawk had never seen publication except in snippets (such as Dungeonland, Land Beyond the Magic Mirror, and Isle of the Ape). There were occasional — unrealized — intimations by Gary that TSR might one day published this megadungeon in a more complete form. When module WG7 was released, as part of the World of Greyhawk brand, no less, I am sure many expected it to be the fulfillment of a long-held dream. I know I did.
Read the Full Retrospective/Review at Grognardia.