A downloadable game

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Equa! is an very minimal OSR adjacent game system for tabletop role playing games.  The whole of the game is formatted as a small set of equations that represent the mechanics of play, how you use them is up to you.

This is about as minimal and esoteric as a game can get.

Character Creation

It has it. 3 whole stats.

Combat Mechanic

A very minimal way to resolve combat damage!


Yes, of sorts.


Will this work with X module I have?
I don't know, maybe, try it out.

Does this have X mechanic in it?
No, it doesn't.


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Click download now to get access to the following files:

equa.pdf 43 kB
equa.tex 1 kB

Development log


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the LaTeX format made me want it.



I have a question, though. If any of your 3 stats is determined by a d6 roll, it may happen that you roll a 6, and thus any action related to this stat would result in a success, because tn will always be lower or equal to a d6 roll.

how would you solve this equation?

Thanks :)

I have actually fixed this now.

I also flipped the equation so that it is d6 < tn which makes more sense than tn < d6, making it that the higher tn the better you are at the task rather than the other way round.

The way I had it was fun but it also made y ou get exponentially better as your Brawn decreased through damage.

Thanks for your interest.

mmmmm now you have another problem if a player rolls a 1 as any of their stats. They can't succeed. But that might be "by design" (poor PCs)

Yes, it’s by design. 

It’s rather a better “balance” that a character be bad enough at something to not be able to do it than it is to be awesome and never fail. 

With an Acrobatics of 1 a player will still be adept enough to run, roll and jump as normal, but trying to pirouette on a balance beam is always going to be a failure. 

that makes sense. thanks!

Oh this has my attention and now I want to drop all my projects to hack on this!

Any thoughts about releasing the original LaTeX file?


Hack away! :)

I’ll upload the tex file in the morning when I am back at my laptop!