What is your favourite lvl 1 starting adventure?

I just ran "Nightmare over Ragged Hollow" by the Merry Mushmen with Moldvay Basic and it was a lot of fun. It's a good starting sandbox with 4 dungeons, a goal and you can easily slap in more content.

Let's get this going.

What's your favorite OSR?

Ones I have, * means played.

OD&D * AD&D * Basic Fantasy * Castles & Crusaders Old School Essentials (OSE) Hyperboria OSRIC Advanced Labyrinth Lord Swords & Wizardry * Pathfinder 2e Dungeon Crawl Classic Tunnels & Trolls

My go to is AD&D...