When I think about underground cave systems, it's hard not to think about FR's underdark. I (somewhat) remember an illustration about adventurers reaching one end of the Darklake... with no other shore on sight.

Now that I look at it again... it may not be 100% clear that the blob in the center is a chute going down. A hole in the ground.

Something more to practice and refine, I guess.

Can't help but think that the stalagmites on the bottom left doodle resemble the tentacles from Maniac Mansion.

It's meant to be played on graph paper. The general idea is a randomly generated dungeon crawl. When you get to a door, you roll 1d6 and draw the next room! Each M is a monster, and each L is loot, which also has random tables to determine what is what, or you could use random tables from any other system with the general idea.

This is the third magnetic sheet I use like this. I like it.

Let me know when it looks like I have an addiction. 😅

Second verse, same as the first,,,

... but this time it's mostly caves.

So... I bought a few magnetic sheets with glue. placed a bunch of dungeon tiles and then cut them to size.

The squigly line to the left of the pit is a curtain of magical darkness (I probably got this idea out of one of the 2e Undermountain boxes).

The curtain itself is one of my favourite things to include in a random corridor in a megadungeon (and change whatever is behind it). Often, the curtain also blocks sound in my games. I usually manage to restrain myself and not overuse it though.

It's coming together.. I already have a few small pieces, and I'm adding many even smaller rooms.