This jam is now over. It ran from 2023-06-01 04:00:00 to 2023-07-01 03:59:59. View 47 entries


Another OSR game jam for the month of June! Make a retroclone! Make a module! Make a bestiary! Make a spell list! Make some cool items or NPCs! Make something fun that would fit in somewhere between 1975's Temple of the Frog and 1984, when Dragonlance ruined everything.

Last year's OSR June Jam had 117 entries from 274 people. There's no reason this year can't be better!


OSR stands for "Old-School Revival" or "Old-School Renaissance" and refers to an ideological design movement that existed roughly between 2000 and 2009 before splintering off into post-movements. Put simply, the OSR was and is a rejection of scope creep and rules changes that began to be introduced to D&D in the mid '80s. With the release of the OGL (Open Gaming License) in 2000, people began creating retroclones of previous rulesets - specifically LBB (Little Brown Books, the original D&D), Holmes (Basic set), Moldvay/Cook (Basic/Expert edition, AKA B/X) and Mentzer (Basic/Expert/Companion/Masters/Immortals, AKA BECMI).

Post-2009 the OSR fractured into numerous quabbling sub-factions and splinter movements based on adherence to the "classic" concept of OSR - ie, "can it run Keep" - or merely emulating the "feel" of older editions and being inspired by their rulesets but not being bound by them or compatible with them. After the loss of G+, the OSR's version of the Library of Alexandria, these Post-OSR sub-factions further splintered into aesthetical discussions of "artpunk" versus "minimalism," birthing the modern movement I call the ASR or "After-School Renaissance."


Be kind to yourself and others, and keep yourself and your work free of bigotry and hate. You can submit just one thing, or multiple things. You can submit something new, or something you've already created. You can (and should!) charge for your work, but you don't have to, either. It would be nice if you used the #OSRJuneJam hashtag to talk about it on Twitter. It would be even nicer if you rated other people's submissions!


Classically an OSR is a retroclone that can be used to create new content for and run old content from pre-2nd edition D&D (so LBB, B/X, BECMI). This definition would go on to include non-retroclones with an old-school "feel" according to some generally-accepted design pillars and now includes a particular "old school" aesthetic.

I may be somewhat of a purist myself - as in "OSR means I can run Keep on the Borderlands without much conversion work" - but for the purposes of this jam, OSR is like porn: you know it when you see it.


  • Labyrinth Lord
  • Swords & Wizardry
  • Old-School Essentials
  • Basic Fantasy RPG
  • Delving Deeper
  • Blueholme
  • Hackmaster
  • Dungeon Crawl Classics
  • Dark Dungeons
  • Beyond the Wall
  • Knave
  • The Black Hack
  • Whitehack
  • Five Torches Deep
  • Solar Blades & Cosmic Spells
  • Into the Odd
  • Mausritter
  • Cairn
  • A Dungeon Game
  • Troika!
  • The Vanilla Game
  • Bastards.
  • Intruders!


Then you can fuck off.

If you're the kind of person that the above statement offends, you can fuck off. 

You can also fuck off if: you're the kind of person that pals around with wannabe culture vulture white supremacists like RPG Pundit, wannabe satanist christian conservative transphobes like Venger Satanis, authors of articles titled "In Defense of Rape" like GrimJim, or are one of the libertarian dweebs that do free PR for the above.

SOME THINGS YOU MAY FIND HELPFUL - Jason Glover has put a lot of his art free for personal and commercial use! Thanks, Jason. - Yochai Gal has made a whole page of links to public domain images. Great work! - Dyson Logos makes maps freely available for personal and commercial use! I've used many Dyson maps for my games. They are excellent. - the OSR Principia Apocrypha, which is pure ideology but has some foundational principals that some may find interesting.

People like logos! These two handsome logos were designed by Matt Jackson and are released Free Forever into the Public Domain with no attribution requirements or possibility of being revoked in the future.

More logos! Jesse Ross (@jesseross) has made this excellent suite of B/X compatibility logos, which are public domain as well! (you can also find them here)


All submissions

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An adventure for Cairn and Mangayaw
B3 converted for Cairn and modern sensibilties
A coastal hex crawl for use in OSE.
A cavern full of adventure for Cairn
A breathless game.
A horror adventure of dark folklore for Cairn
a Bastardized Classic module for your favorite fantasy RPG.
Treasure waits for the taking in a tomb full of trapped souls
A grasslands hex crawl for use in Old School RPGs.
And hast thou slain the Jabberwock?
Character classes for Mausritter
a Bastardized Classic module for your favorite fantasy RPG.
A Mausritter adventure with war and political intrigue
A compendium of nature-themed spells for Mausritter
a bastardized classic hexcrawl for the greatest ttrpg.
An OSR epic fairytale adventure for the Cairn RPG.
An Old-School Gamebook RPG
A starting Kiwi Acres adventure for Mausritter
New creatures for Mausritter
An adventure for Heartseeker & OSR games
A hexcrawl for the Mausritter game
Oracles, Sorcerers, and Witches for Old School Essentials
Enter the monastery of an ancient order to retrieve their healing elixir!
Silver-tongued rogues, roadside ne’er do wells, dashing barroom bravos.
Sword-mages, warriors with blade and spell, skilled in both but never a master.
Mighty thewed warriors, frost land sword-maidens, and dwarven goblin-slayers.
Rules lite D6 based fantasy ttrpg system. Be You Coward? Or, Be You Bold!
Faithful mage-priests, cultists who serve arcane spirits, occultists who practice primordial sorcery.
A region setting full of maps, encounters, treasures, and adventures to drop in to any fantasy OSR game
A Classic Traveller Setting
An adventure for CAIRN | Una aventura para CAIRN
Our curated collection of magical items, all share a curious property: they affect both the character AND the player!
A collection of 4 NPCs who add charm & pep to any campaign!
A simple hack inspired by The Original Fantasy Game (1974)
A martial arts micro setting by Daniel H. Kwan
A complete '74 retroclone.
A zero-level dungeon for Intruders! or other OSR games.