From the introduction:
Reading Playing at the World inspired me to run a session of OD&D + Supplement I at Anonycon 2012. My original plan was to use Stonehell Dungeon: Down Night-Haunted Halls as the game’s dungeon, but revisiting the LBBs got the wheels spinning in my head and, rather than adapting existing material, I whipped up a new “old school” level for the dungeon. I didn’t bother with making direct connections to Stonehell as written, instead following my muse and idly sketching away on my new pad of 6 squares per inch graph paper. The following is the result: Stonehell’s “Lost Level.”
As it was written for running and not publication, it’s in a much abbreviated and incomplete format. You won’t find notes to certain hallway traps (as indicated on the map), nor has it been extensively edited or proof-read. But since the second Stonehell book has been delayed again and again, I thought faithful fans deserved a treat to tide them over. Here it is. Consider it a raw glimpse inside my head and a small token of gratitude for enduring the delay. I hope you get some enjoyment or inspiration of your own from it.