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Here's something I finally had a chance to finish up. I turned the Monster Mountain micro-dungeon I posted here last year into a one-page pdf. It's written up for Holmes Basic, using the stat block from the original B2 Keep on the Borderlands - DX stat included. However, you should be able to use with any old D&D without changing anything.
It's modified a bit from the original write-up. I added one of my favorite monsters - stirges - to room 3 to explain the gem stuck in the crack in the floor. In Holmes Basic, stirges are treasure type Q, which is Gems or Jewelry only. I interpret this as a fondness for gems.
It's an intended as an introductory adventure for new players, especially kids. The dungeon is a simple puzzle, and relies on text adventure type solutions - most rooms have an obstacle that can be overcome using an item found in a different room, although this being D&D other solutions are certainly possible, as determined by the DM.
The dungeon was built out of Lego Heroica, the sadly discontinued Lego game series from a few years back. If you have a few Lego Heroica sets you could recreate the dungeon build yourself. Otherwise it should be simple to recreate with dungeon tiles or for player(s) to map.
I ran this dungeon for a child running a single 4th level fighter, but it should work for four 1st level characters. So I'd call it an introductory adventure for 3-5 character levels.
I've also added it to the resources on the Holmes Ref page.