Escape from Groncho's Lair (2013)

From the publishers blurb:

Most adventures involve getting to the absolute bottom of a dungeon, blithely swinging hammers andswords through warriors and civilians, pillaging and looting along the way.

This adventure inverts the traditional model: The adventurers easily run through a surprisingly unpopulated goblin warren and then get struck with amnesia at the very bottom. They know their identities, skills and class abilities but have no idea what’s happened over the past several days. Players must fight their way out of the dungeon through increasingly threatening encounters, culminating in a “boss” battle as they hit the surface.

This adventure is designed to be system agnostic, but would be ideal for an old­school system played bv a group of players familiar with new­ school RPG systems. The difficulty is suitable for level 1 or 2 characters and would work well as a kickoff adventure for a campaign, since you don't have to awkwardly handwaive that "so you're all in a room" thing that usually happens at the start of a campaign.