A downloadable Zine

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is a rules light, grim dark fantasy roleplaying game.

Made to print, pick up, and play; Sledgehammer's two mini-zine format offers a rules set that encourages free-form collaborative roleplaying for grim dark fantasy scenarios.

Sledgehammer Core Rules Zine

  • Simple single roll D100 resolution system
  • Quick and customizable character creation
  • Character sheets included in the core rules booklet so you can print a copy and give one to each player.

Ref Book and Expanded Rules Zine

  • Guidance for running the game. 
  • Sample Non-player Characters.
  • Random tables for quick scenario inspiration.
  • Optional rules for Mutations, Critical Hits, and Advancement.

This download includes:

  • The Sledgehammer core rule zine
  • The Ref Book + Expanded Rules zine
  • Both provided in pdf files for printing and screen
  • Sledgehammer Compatibility Logo 

Sledgehammer's format and design is inspired by NOSR by Nate Treme and Highland Paranormal Society.

Special thanks to Matthew Gravelyn for creating the One-Page Zine Template used for layout.

If you want to create your own content for Sledgehammer just include the following text in the description:

"Based on Sledgehammer by Gayhalforc. [INSERT NAME HERE] is an independent work compatible with Sledgehammer but not affiliated with Gayhalforc."

Check out more content for the game from the #Sledgejammer!


Listen to me talk about Sledgehammer on the Draw Your Dice Podcast with Jeremy Gage


CategoryPhysical game
Rated 5.0 out of 5 stars
(70 total ratings)
GenreRole Playing
Tagsgrim-dark, OSR, Tabletop, Tabletop role-playing game, warhammer, zine


Buy Now$5.00 USD or more

In order to download this Zine you must purchase it at or above the minimum price of $5 USD. You will get access to the following files:

Sledgehammer_JohnGeary_2021.pdf 3 MB
Sledgehammer_Screen_Johngeary_2021.pdf 3 MB
Sledgehammer_RefBook_Johngeary_2021.pdf 4 MB
Sledgehammer_Refbook_Screen_Johngeary_20201.pdf 1 MB
Sledgehammerlogo.png 75 kB

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The link to the podcast appears to be down. Is there any other address where we can hear this?

Its the Draw Your Dice podcast, episode 12 "OSR with Love"

If I'm including a shout out to Sledgehammer as an influence on a game of mine how would you prefer to be credited?

Sledgehammer by gayhalforc

really dig your game. Also love the podcast episode. Also from MA and also spent a brief time at the GW store in the mall. Cheers 


I am wondering if it would be possible to heal wounds without marking Corruption, through rest for example. Or is it intended that the only way to heal is through Corruption?

You can play the game however you like.  The cost of corruption to heal is there to  enforce the tone of the intended game , but you can adjust it to fit your game.

So, this is basically a simplified version of Dark Heresy and all those other Warhammer 40,000 RPGs.


No, it’s a simplified version of Warhammer Fantasy Roleplay. It’s not 40k, though it’s so lightweight you could play it that way with some very minor hacking. For example, you’d probably need to come up with new 2d10 Clobber and Career lists.

Whoops! My bad! :3

In all seriousness, I came to this page from a Brighthammer 40K mod, so that might be the cause of my confusion.

(2 edits)

Hi! I love your game system and I wrote an hack woking deeply with your base game system.

Is it possibile to publish an hack of Sledgehammer (it is not a small booklet :P) with the sentence ""Based on Sledgehammer by Gayhalforc. [INSERT NAME HERE] is an independent work compatible with Sledgehammer but not affiliated with Gayhalforc."" and without any commercial purpose  under the CC-BY 4.0 licence?

The new derivated game  is totally wrote in italian :)

Thanks for this game!!!


Go for it! Thanks for reaching out.

Thanks a lot for your answer! And obviously for your base system!!!

Sledge the world!!! :D

Hi John! It takes me long time since I started to work on :) But I finally finished the hack (actually I just realeased it in italian, but I'll translate in english too in the next monthes!). Check my page for ROGUEhammer just to see the final result :)



How would you handle magic in this game? 


I haven't considered it yet! The rules have been intentionally left as small as possible for people to create their own content. If you end up creating some rules for magic I would love to check them out. I am not currently developing any additional material for this version of the game. Thanks for your interest <3


I made this for the Random Adventure Jam: https://nightmace.itch.io/sun-in-the-grotesque-environment


Very cool stuff! Can I translate your game for the Brazilian community, gayhalforc?


Send me a DM on twitter and maybe we can work something out!


Has this been done? :0


Not yet. :/


If you need some help with the translation! Can't help much with layout but would love to aid somehow!

(1 edit) (+1)

I really like the escalating advantage/take +10% forward system, and how you can give it up for a retreat. Really clean and simple, pushes gameplay towards certain tropes.

Like many rules-light systems, you'll have to fill in the blanks with your own preconceptions. e.g. how does initiative work, and do NPCs have similar stats to players? The "take the 10s digit of a successful attack, this equals damage dealt" would suggest this, because The Black Hack-style "roll over player's stat to hit" would produce only really high damage numbers.

edit: I missed the ref booklet, which answers this question. NPCs deal static damage on a failed roll by the player.

(this isn't meant as a criticism--there's necessarily gaps when a game fits onto a single-sided A4 sheet. Just a forewarning for people not sure what to expect)

Thanks for the kind words!


Sledgehammer might be the first d100 system that I would recommend with absolutely no reservations.

It's two pages total, including both a GM and player document, and it has a fun and extremely readable hand-lettered and illustrated visual style.

Mechanics-wise, it's direct and simple. You're trying to roll d100 under one of your four stats, and adding bonuses for any relevant backgrounds or equipment.

However, to negate the swingyness of d100 systems, when you get into combat, every time you deal damage or create an opening you increase your odds of hitting. This gives combat a sense of continuous acceleration.

Damage is still pretty swingy, with your tens die determining how many wounds you deal (5 is your max, unless you take corruption to get to 6), and there's hit locations and critical damage rules to make things even more potentially brutal. So this is probably not a system where you get *extremely* attached to your character, but there's also neat progression rules if you do stick around.

For GMs, there's some short but solid advice sections and some potential NPCs, but Sledgehammer feels like it's so easy to write for that bashing together a scenario or borrowing a scenario from another d100 fantasy game wouldn't be any burden.

Overall, this is a well-made, easy to use thing with a clear aesthetic and strong mechanics. If you want to tell a mud-and-blood fantasy story and don't want to finely machine together a complex statline to do so, Sledgehammer should probably be your go-to.


Thank you so much for the kind words, I'm a huge fan of your reviews.


Thank you for writing the really cool game!

“If an attack roll is successful, deal damage equal to the first digit of the tens die. EX 25 = 2 damage.”

Probably just being dense : ) but how do you determine is the roll is successful? Thanks!


Anytime you roll the dice you need to roll under one of your 4 stats. Here's an example.

You want to attack a monster with your sword. Start with your weapon skill of 25. Lets add some bonuses:

+10 for having a sword
+10 for knowing about dueling from your career
+10 for the point of Advantage you get for charging into combat

You need to roll under 55. You get a 36, success! You do 3 points of damage.

I hope that clears things up! Thanks for the question.


Ahhhhh, now it's clicking! Thanks so much, dude.


Is there any downside to spending corruption? Especially since demons deal corruption instead of normal wounds, it seems odd that it's a consequence-free resource as long as you keep spending it before it fills up.


The severity of consequences cause by filling your corruption clock are up to the table. It’s intended to be a way to scale the tone of the game. If you succumb to the dark gods, you should prepare for the worst, what “the worst” is, is left up to you. Thanks for the question!


So...I am correct in understanding that however severe the consequences of filling it, you can dodge those consequences by aggressively spending your corruption for +10s and Healings?


It just seems like it would make more sense to have to MARK corruption, like when you're under demonic attack, instead of spending it, to get the bonuses.


spending and marking both fill a segment on the clock. Might just be my wording. 


That...makes a LOT more sense. I thought that sense they were under separate headers they were separate things. So it's "spending" corruption in the sense of spending one of your free slots.


Character creation is quick, the rules are clear and easy to learn, and the way combat speeds up as turns pass is amazing! And it's so easy to add to and hack. Ditch your slow & clunky fantasy RPG and pick up Sledgehammer instead.