RPGMemes

Megadungeons are a bit of a relic from previous editions, when mapping was a large part of the experience. If you're going to run one, I recommend using B/X or even OD&D and perhaps scaling down a bit - Old megadungeons were made when entire college dorms played in a single campaign, and were meant to grind down party resources.

Mega-dungeons are great. I'm running one now and I basically have zero prep, I made the dungeon and just see where they go. They go in the dungeon and explore, get into some trouble and grab some loot. It's honestly so nice to have them dungeon crawling. My last game I was juggling plot lines across 5 cities and making custom content constantly in prep. I was burning out between 5e and building content every week.

5e Undermountain is a very poor megadungeon.

We would try to create a map, then be like nope and go outside again

Where did you find this map‽ that’s so much more than the first level of DotMM. Is this an old version of Undermountain?

I remember playing Keep on the Borderlands back in the 70’s. I think I might have been one of the very few at the time that questioned thee necessity of these giant and seeming pointless gauntlet style dungeons. Was so fun playing back then, but man… the logic you had to suspend just to move forward three steps. 99.9% of every dungeon was entirely pointless. But by god they were so fun!

I refuse to believe anyone actually ran this module.

I've wanted to run The World's Largest Dungeon ever since I saw a blog post about it on a webcomic site. I've bought and read through it a few times, and stolen chunks of it as dungeons in other games.

You should check out the halls of Arden vul it's massive. There's a let's play on YouTube right now that is epic. Some of the best examples of old school play out there.

https://youtube.com/playlist?list=PLtBYin1uOBmCs1hSQQqxesYPbod7Y5Cfq

I loved Dungeon Keeper so much.