Dhunprick Manor
At the end of this blogpost is an adventure scenario (a hexcrawl and a 50+ room dungeon) in .pdf form.
The majority of the characters who played through this scenario were fighters with levels 3+. We typically play in groups ranging from 4-7 players. Their HP was a little more inflated than usual (In the referee's rules, a fighter has d8 and monsters only have d6 HD) and a character's damage depends on their Hit Dice instead of the standard d6 damage dice for everything. As a result, they steamrolled pretty much everything in here. I imagine that a normal OD&D party with more reasonable HP totals might find this scenario reasonably challenging.
When Devil World's Heroes (the name of the current campaign) began, I had just finished playing a game of Shizzards. The name generator for Shizzards declared me "The Dhunprick Slipper." The Dhunprick Slipper became the name of my thief, a completely hairless man who loves being covered in grease and sees the world as a medium by which that holy substance is expressed and created. In other words, he's a total weirdo. Dhunprick, then, became a natural place for the party to go while our referee for DWH was on hiatus, and I leapt at the opportunity to give back to the wonderful folks who play that game with me.
It's worth noting that the treasure in this adventure is for the silver standard (1sp = 1gp, items are priced in silver instead of gold) and that adventurers in DWH get 100xp HD for any opponents slain/routed during combat.
This is basically my own scattered notes compiled into one document and formatted, so don't expect anything polished, coherent, or even complete. If you're nervous about running something you've made yourself, let this be an example! You need less than you think and what you do need can be as lightly sketched as all of this, which lasted about 3 sessions.
Thanks to everybody involved in the Sunday DWH game; it's genuinely been a highlight of my week whenever it rolls around and I'm so lucky to be able to play with so many elite gamers.
You can find the adventure here.