This jam is now over. It ran from 2021-01-29 06:00:00 to 2021-02-12 06:00:00. View 20 entries

Sledgehammer is a rules-light grimdark fantasy game by John Geary/gayhalforc, and it's perfect for hacking! John has kindly left room for us to create additional rules, settings, creatures, and variants, and that's what this jam is.


  • Keep it small! Sledgehammer fits on a single page, so it would be cool if yours did too.
  • Keep it messy! Part of Sledgehammer's appeal is the aesthetic, dude. Smash that entry out like you've been inspired by the God of Chaos! (But feel free to include a text version for accessibility.)
  • Keep out the fascists! Sledgehammer is a grimdark world, so the baddies are pretty bad, but that doesn't mean that you should be. Content promoting racism, homophobia, transphobia, fascism, etc are not welcome and will be removed.
  • Charge for your entry! If you want to give copies away, consider the Community Copy model in addition to charging.
  • Include the license in the description: "Based on Sledgehammer by Gayhalforc. [INSERT NAME HERE] is an independent work compatible with Sledgehammer but not affiliated with Gayhalforc."

Here's a zine template.

Here are some logos:


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Rules Light Grim Dark Fantasy RPG
6 Weirdos and a Bone God for SLEDGEHAMMER
A Rules Light, Occultech Horror Science-Fantasy RPG
Rules light space fantasy
Polearm character options for SLEDGEHAMMER
Start with 5 characters, who will survive?
A pocketmod scenario & bestiary for Sledgehammer RPG
A micro zine that adds rules for hirelings to the rules-lite RPG Sledgehammer.
Gruesome rules to spice up your combat with the 5 Elements!
A SLEDGEHAMMER hack for playing as beefy witches with hammers.
Strange abilities for grimdark fantasy
Modern-ish Horror Setting for Sledgehammer!
an awful house in springfieNd for Sledgehammer
A class for Sledgehammer
Monsters for MOONHAMMER or other Sledgehammer games!
Rules Light High Fantasy Roleplaying
A Class for Sledgehammer by Gayhalforc
Fight skyscraper-size fish with GIANT ROBOTS.