Submissions open from 2026-03-02 10:00:00 to 2026-03-31 09:00:00
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Let's keep this brisk.

The Havoc Engine powers Eat the Reich, our game of monstrous and sexy undead kicking apart nazi scum on the streets of occupied Paris. (It also powers Goat Crashers and Havoc Brigade, but odds are you haven't heard of either of them.) 

If you'd like to make a something using the engine, you're in luck - we've written a comprehensive guide on just how to do that, and we're also organising a jam about it, so that's nice isn't it.

You can download the Havoc Engine Toolkit via our website

Or get it through itch.io here.

You can also join our Discord, where we have a discussion channel dedicated to Havoc Engine design, here.

The jam starts on the 1st of March and runs for a month. During that time, you'll make your very own Havoc Engine game. (That's the hope, anyway.) It doesn't have to be about antifascist vampires - it doesn't even have to be especially action-packed. We reckon you can strongarm the dice mechanics into doing some pretty interesting things, and we'd love to see what you can come up with.

You can (and should!) make any of the below:

- An entirely original game using the Havoc Engine
- Some more characters or adventures for Eat the Reich
- A new mechanic for Havoc games you think is fun
- Characters or adversaries for someone else's Havoc Jam game (ask around!)
- Something else related to the Havoc Engine in general (convince us!)

Once the month is up, voting will be open for two weeks. Only folks who've taken part in the jam will be allowed to vote, which makes it all fairer.

Winners get... something. We don't know what yet. Something fun. But the prize isn't why you're here: you want to make something.

BORING SPECIFIC RULES

- No fash
- No slurs or discrimination or any of that shit
- No gen-AI rubbish
- Make sure you've got the rights to use any art in your submission if you use art
- Credit us somewhere, like this:
"This game was built using the Havoc Engine by Rowan, Rook and Decard"

FAQ

Can I start before the jam begins?
Sure, whatever. I can't stop you. Doesn't feel sporting though, does it, so I'd keep quiet about the whole affair if I were you

Can I submit more than one entry?
Go hog wild. Probably better you focus on one good one than several naff ones though

Who has the rights to the game I design?
You do! You can do whatever you want with it. You have to credit us with the design of the base engine, though, or we'll cry

Do I have to follow the steps outlined in the workbook?
Nah


Submissions(48)

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Roleplaying in a Mesolithic land indifferent to our struggles, giving gifts for aid while trying to appease evil spirits
Several octopuses in a friar's robe infiltrate the Church, the ttrpg
grow your nails and fight
Disabled people fighting the horrors of Ableism, the TTRPG.
Save the day from pollution and evil as trash goblin magical girls in this modern fantasy short-shot roleplaying game.
A one-shot romp about fighting aliens and bigfoot to stop a volcanic eruption.
An unhinged game about intergalactic punk rock
a Havoc game about Parkour Punks
A gang of greenhorn bandits might stand a chance of robbing this space train and getting away.
A Game About Mechs
Mall cops are ruining the mall, they got to go. 8pg ttrpg using the Havoc Engine.
A Havoc-Fuelled TTRPG About Supervillains Fighting For Their Freedom
The RPG Where Your Origin Story is the Story
A Havoc-fueled TTRPG set in a fanfiction universe not near you!
a one-shot ttrpg about pigeons
A spooky fantastical tavern TTRPG. Serve your patrons, deal with obstacles, and embrace the spirit of hospitality
TTRPG about journeying to get some food from a Pop-Up while trying not to Crash Out built with the Havoc Engine.
A TTRPG about a punk band fighting the system and getting into trouble.
A Havoc Engine Game about Riding out the end of the world with your friends
A random location generator for games using the Havoc Engine.
A TTRPG about punching bad guys made with the Havoc Engine by Rowan Rook and Decard
A Havoc Engine holiday special about trash goblin magical girls saving the holiday pantomime.
A Pirate Adventure Unleashed by Havoc
World War 1 trench warfare TTRPG using the Havoc Engine
A character and enemy for Eat the Reich
A crack team of Cryptids must stop the escalation of the Cold War.
Weird heroes rescue earth from AI nanite plague
an unofficial Expansion for Eat the Reich about the Nazi’s Chemical Industry
New mechanics, characters, and play scenario for Eat the Reich
A Havoc Engine game about newly mortal Gods on the run from their mortal children.
TTRPG about Detectives with strong gut feelings
A Havoc Engine TTRPG about causing havoc with engines
A solarpunk & superpowers adventure ttrpg
A havoc engine game about resisting colonialists
Petty skeletons get vengeance on those that wronged them in life.
A Havoc Engine Jam entry - A one shot of pub musicians and bardic magic vs fae incursion
Magical alligators breaking out of the Palace Versailles as reality breaks down around them.
A Havoc-Engine game of psychological samurai drama and demon slaying.
It's 1972, you're an underground Marxist revolutionary cell, and you have 5 days to break your leader out of jail.
A Havoc Hybrid TTRPG about working-class knights ready to dungeon delve, joust, and fight their way to a better life.
A Havoc game about stealing the Nazi gold train and blowing up a fortress.
Arachno-powers, nerd responsibilities.
Robot-killing, person-punching, drug-using race through the only city on the Moon
Firefighters in a fantasy city face a towering inferno in the form of a burning wizards' tower.