A downloadable game

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The Plot Unfolding Machine (PUM) is a one-pager GM Emulator that helps you come up with scene proposals, challenges and stakes for your PCs to fight for. What stands between your characters and their goals? Who is opposing them, and how? What happens next?. These are questions PUM tries to help answer, moving your game forward.

By placing conflict at the center of the adventure, you'll find your characters having to fight for their goals, and your RPG system to actually matter. PUM's main goal is to bring Solo RPG players back to the player side, lowering the GM authorship effort on the game content.

LANGUAGES: English, Spanish

NOW AVAILABLE: Scene Unfolding Machine to unfold the scenes from the inside out and check for GM Actions!

RECOMMENDED with: Mythic GME Tools on Foundry or Play by the Writing for playing as you write (or why not both?)

What will you find inside?

  • One page with an explanation of the system mechanics
  • One page with a game example with four scenes
  • One page with scene setup tables
  • One page with oracles for questions

The extended edition includes:

  • Two pages with general advice
  • Two sheets for setting up a Solo RPG Adventure

Join me and let me know how this works for you :)

Check out my blog here: https://jvhouse.xyz/

Updated 5 hours ago
CategoryPhysical game
Rated 5.0 out of 5 stars
GenreRole Playing
Tagsmythic, solo, Solo RPG, Tabletop role-playing game, writing


Download NowName your own price

Click download now to get access to the following files:

PUM Game Sheet - Standard 1 MB
Plot unfolding machine v4 - Spanish - Print.pdf 3 MB
Plot unfolding machine v4 - Spanish.pdf 3 MB
Plot unfolding machine v4 - Print.pdf 3 MB
Plot unfolding machine v4.pdf 2 MB

Development log

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Hi, friend, I am very excited for your system, and I print it and laminate it so that I can use it with my solo games. But could you add a little change log to every new version, to know if the changes are worthy for me to print it and laminate again? I can do it, but reading comparing side by side both versions is not comfortable. Thank you.

Thank you, and sorry for the frequent releases. I continue refining it as I play, but all are good and as long as you are okay with them and see nothing wrong it is what matters. Regardless, you are right, and I will try to be more specific as in the past.

For now, V1 is the "classic" version, where skills were specific and the tables were open to be used as you like. V2 is a focused version where prompts are more vague and up to you  to read, and V3 is like a "sentence builder" you roll phrases that give you everything you need to setup a scene.

Don’t worry. I like the fact that you keep refining it. I read the third version and found it better than the second one, but maybe I would keep the second one for more options to roll on tables but using the third one as base. I also printed the first one, for reference and will be using it for inspiration. What I meant is that, for instance, if I print and use the version 3.0 and then I see that you have already published the v.3.2, I wonder what the changes can be compared to v.3.0. Will it compensate me to print it again, will it be just cosmetic changes, one phrase, or a new table that maybe would make the game much better? Without a log, I can only just forget about successive improvements or otherwise it will never end, or check carefully side-by-side the previous version and the new updated one. If you just include a small developer’s log explaining “I changed two phrases, this and this”, or “New table X added”, or “Mechanics revamped”, then it would be easier to correct my own print with a pencil for small changes or decide if it’s worthy to reprint the new version, or just pass until a new major update. I like a lot what you are doing. And I intend to deepen in the use of Foundry and Obsidian to play ttrpgs, following your advice in your blog. It would be nice if you could show more how to setup Obsidian for that.

Hi the 3.0 and the 3.0 Print are the same.

Thanks! fixing

Thanks but there is a little difference on page 2 Scene Prompt #3 "take risk" (v3-0) "an opportunity to" (v3-0 Print)

Hey Steve! You do have a keen eye my friend!!!

Today I found the time to correct this. Sorry about that. The correct phrase is "A risk to... {Risk}, in order to... {Goal}". Thanks


Oooo print version is very welcome :) As well as the detailed advice. I haven't had a chance to play yet but looking extra forward to busting this out as it looks like a unique way to guide the story along. I especially like the focus on the 'game' aspects in it's design. Also thank you for your blog too, it's very inspiring!

Hello RestlessThoughts, thank you so much for the nice words! I just updated to Revision 21 so I hope you didn't print yet :) I have made some cool changes!

Revision 21 looks really good! I wanted to second the appreciation of the detailed advice on how to use the tool.

I'm downloading all updates as they come in and really appreciate their frequency.

PUM has quickly become one of my core tools for playing solo rpgs.

This is amazing.

It's done so much to make starting up a solo campaign easier. There are a number of ideas that I've never been able to explore that I now have prepped and ready.


This thing is absolutely brilliant!

Really appreciating the additional oracles.

Oracles like action/theme and descriptor/focus like in Ironsworn Starforged would be nice.

Keep up the great work!

(1 edit)

Thank you!! I have been wanting inspirational oracles too. Currently, "Looks" is a bit bare bones and "Intent" or "what" are quite pin-pointed to certain questions. Will be thinking about it, but don't underestimate them either! I'll think what is really missing, intent is really powerful.

Hi, I am very interested of this document but there is an error.

The attached file is a txt instead of a pdf, and opening the txt, it contains a lot of meta data etc. Would you please upload the correct format? 

Thank you


(1 edit)

I am so sorry about this. One should never make changes at 2AM. Fixed! The txt file was just a wrong file I uploaded

Thank you very much! 

(3 edits)

Hi, I red it and it looks great, now I have to try it in play.

May I suggest you to change 3 lines in the document? 

1st page: 1.Propose a scene, then roll Scene Designer Expectation Checker to verify it,...

2nd page: In the scene 1 and 4 has to be written like in Scene 2 and 3: Scene Designer ->... and Scene Challenge Designer ->...

Thank you

Good job.

Very appreciated that you took the time to point out this errata. I've been doing short edits during travel, also playing with it :) thanks

(1 edit)

It looks very interesting, but could you explain me how to better visualize the file?

(1 edit)

I am so sorry about this. One should never make changes at 2AM. Fixed! The file type is now a PDF you can check with any PDF Reader.

Very cool product. Like the scene designer. I very much like your blog.

Ohh you are so kind, thank you! I really enjoy the topic of playing RPGs without a game master, firmly believe there is so much to explore :) - and even more sharing such ideas with others


may i suggest you add a preview