Under Xylarthen's Tower (2008)

user summary:
A six level semi-gonzo, old-school OD&D dungeon crawl with some homebrew rules included for character generation.

from the introduction:
The dungeon levels below the tower of the wizard Xylarthen began life as an attempt to create an ‘authentic’ dungeon using the random dungeon stocking methods outlined in Book 3, The Underworld & Wilderness Adventures, with an eye towards creating something playable as a one-shot at the 35th annual Winter War game convention in Champaign, Illinois. Because I am the kind of gamer who enjoys rolling on many random die charts, I also employed some of the tables found in the Judges Guild publication Ready Ref Sheets, particularly the elegantly simple random dungeon charts and the goofy magical statue generator.