Summary: 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. Free demo of The Deck of Many Dice: To go with The Deck of Many Dice, I'm giving everyone who owns The D1 RPG a free demo containing the only card needed to play the D1 RPG. For more information, click here. If you bought the Itch.io Bundle for Racial Justice and Equality, you already own this. You don't need to buy it again, just check your bundle page.