A downloadable TTRPG

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This is a booklet detailing the construction and operation of one sided dice for use in a setting agnostic tabletop RPG system.

It might seem silly to play an RPG that only uses one sided dice, but in practice...
...it is indeed quite silly.

Why a D1?

Legends tell of a die that is perfectly weighted, with any face having the exact same chance of being rolled. A die that removes all chance from the equation. Only a skilled crafts-person could construct such a marvelous die, correct? It would certainly seem that way, especially when taking into account the most wondrous feature of this object: it only has one side. In truth though, you can make one in under 10 minutes, using materials you (almost certainty) already own and with only the most basic crafting skills.

What you get:

8 pages (counting covers), black and white, zine format, 1 sheet of paper. Just print, assemble, and play!

Jam Notes:

While I started this game before the Jam, the "Bad Tabletop RPGs Jam" and this tweet's focus on absurd die face counts reminded me of my unfinished draft of this game, motivating me to finish it.

(2/10/2023 - Finally added a PDF as a more convenient way to read this on a computer)


Download NowName your own price

Click download now to get access to the following files:

The D1 RPG (1-page, printable) 1 MB
The D1 RPG (PDF, 2-page spreads) 1 MB

Development log


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Hey, that is preety cool!

Thank you!

I found the one sided dice :D

Step one: Grab ball. Step two: Profit

Hi, I’m explanding the D1-verse here https://dereel.itch.io/gamecraft

community copies are out

Thanks for telling me! I've added another 30 copies.


Have Concept Games Gone Too Far?!

(No, not really. Plus this one's fun and makes a completely valid point.)

There's even a handy guide to creating your own D1 if you flip the sheet upside-down, so it's reasonable to say this game is educational.

I would absolutely recommend this to anyone who is interested in game design.


Jon Arbuckle Eats pizza


Step 1/1: Make a Möbius Strip


you've done it, you've broken ttrpg's down to their basic fundamentals.