This jam is now over. It ran from 2022-12-24 23:00:00 to 2024-01-31 23:00:00. View 47 entries

The Dungeon23 Jam has been created to track projects that participate to the Dungeon23 challenge.  

The challenge has been sparked by Sean McCoy, designer of the SciFi horror RPG Mothership.

The idea is pretty simple: design a mega dungeon in one year, one room per day, 12 levels. Each day, do something, even the smallest thing, like adding an empty room. Since the initial spark on Twitter the #Dungeon23 challenge has sprawled in a variety of sub challenges: Facility23, City23, Horror23.

You can of course submit a draft, WIP,  unfinished project. 

Your project doesn't have to be strictly Dungeon23 and can be derived from it (Horror, contemporary, etc)

If your project is not written in English, please add an English blurb.

The jam has already started and will last until January the 1st 2024.

This jam is hosted by Iko and has been sparked by the following tweet.


You can also add your project to this online form

And see all the projects here

- - - - USEFUL LINKS - - - -


MISC Resources

Lots of resources

Lone Archivist's asset pack





If you think I should add some useful resources (links, articles, tables) to the jam page please drop them in the comments or send me a DM, I'll add them

Dungeon23 banner and cover image by Lone Archivist released under CC BY 4.0 licenses.


All submissions

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a 39 room adventure location written to be played with the Into The Odd system
Printable isometric sheets for dungeon planning.
build a dungeon, 1 room a day.
Suburban horror minidungeon
A pocket-sized map-making tool.
A print-ready workbook to help plan and create a dungeon or megadungeon.
A mega-dungeon in the making that will play nice with Frontier Scum
A short helper doc for Dungeon23.
Graphic Assets Pack for anyone working on the Dungeon23 challenge.
Printable dungeon planner template for Dungeon23
The greatest horrors are the ones closest to home
find monuments in the sprouting ashes of the future
The village of Langwick, it's inhabitants and the surrounding areas. My #dungeon23 submission.
A quick system for generating small arrays of dungeon rooms and corridors using a standard deck of cards
54 printable zine-fold dot-grid weekly A6 journals - for Dungeon23
For the dungeon23 writing challenge, here are 52 tombs, all of 7 rooms.
A mega point crawl based heavily on classic films. A #dungeon23 project.
A system-agnostic 7-room dungeon with a humans vs constructs theme
A fantasy city based on Sean McCoy's Dungeon23
A Magical Reform School for Troubled Wizard Children
Jewish Megadungeon for Dungeon23
A TTRPG about a wizard who is unable to let go of the past.
Short ideas for FRP adventures, with monsters & maps
A megastructure dungeon. In progress until December 31st 2023.
challenge dungeon 23 , 12 levels of dungeons for osr games, comes in french and english
A complete campaign for Original, Basic, and Expert fantasy RPGs
Hairic's Dungeon23 project, about a dwarf fortress and everything below it.
A giant underground prison. Dungeon23.
A funhouse milieu for Old-School Essentials
A #dungeon23 project about time
An American Midwestern town has trapped itself in a pocket dimension
Sci-Fi Megacity Crawl
A dungeon23 decent into the Netherworlds.
An alternate schedule for people participating in the Dungeon23 challenge. Relies on a daily d8 for guidance.
a #City23 variant on the #Dungeon23 project