Geekery: Introducing the D120

disdyakis triacontahedron d120

Take a look at the newest and last die you may ever need – the D120.

Robert Fathauer and Henry Segerman of The Dice Lab designed this disdyakis triacontahedron that covers any roll you can make with a d4, d6, d10, d12, or d20. It is perfectly numerically balanced – opposing sides sum to 121, each corner, etc. The mathematical balance is thanks to Oberlin College professor Robert Boschinteger programming, and persistence.

Take a look:

You can buy your own here for $12 each – be sure to check out the rest of their odd, but balanced dice here.


What game would you use this beauty for?

  • Mathew G. Smith

    I am genuinely shocked the numbers aren’t in base 12.

  • Ben_S

    Opposing sides sum to 120? So it’s 0-120 then?

    • Davor Mackovic

      In the video it says 121 is the sum. Bad typo. I guess they are like GW, no editing or proofreading. 😛

    • That was my typo – it has been corrected to 121. Sorry for the confusion.

  • Horus84cmd

    hmm whilst a interesting engineering and mathematical challenge to have solved I really can’t fathom a real practical need for this. Mind you I am not fan of anything larger than a D10

    • euansmith

      I’ve got a D7 somewhere around here. I’ve never really had any use for it, but I had to buy it ’cause its a freakin’ D7!

      • Horus84cmd

        I think I’ve got one of them some place too! I was never convinced it rolled in a fair way.

      • Beyond the Gate of Antares comes with a D3 😉

        • Horus84cmd

          *shudder* wow so not needed. I’ve got hundreds of D3’s…

    • JPMcMillen

      No love for the D12? It’s really an underrated die.

      • petrow84

        No, if you play Force-on-Force, or any Ambush Alley system, it comes up pretty often.

      • Horus84cmd

        Nah seems unnecessary. D10s are pushing it. I just see any system or game that needs to use dice greater than the humble D6 are potentially overly complicated.

  • dave long island

    D120… Pffft.. When I was a kid we rolled the d20 ten times and we liked it. It helped prepare us for the endless monotony of modern life….

    • Tyris

      …that would give you a number between 20 and 200. Even if it were a flat distribution and not a curve, you’d still be looking at 120 as close to your average, not your high end.

      • dave long island

        Pfffttt… When I was a kid we didn’t have flat distributions. We had to walk up hill both ways for our daily distributions. And we liked it…

        • Horus84cmd

          Pfffttt…only walk? walk? When I was a kid, we had to dig our way up and down hill for our daily distributions. And we like it so much we did it twice.

          • euansmith

            A Shovel?! A SHOVEL?!! We’d have killed for a shovel…

          • Horus84cmd

            Well I say “shovel” it was really only a piece of paper on a stick, but it was a shovel to us.

          • Bran D

            You had sticks?! Oh man you had it easy.

          • dave long island


    • This is the single best conversation I’ve seen in a while. Bravo guys.

      • dave long island

        Cool, thanks man! 🙂

  • Gustav

    One assumes GW has had these for years to assign points values.

    • Tim Kennedy

      Except theirs is loaded to assign better to newer models 😛

      • eMtoN

        Also, I’m pretty sure they have “special” ones for each army. Kinda like how some people have that “special” die for rolling plasma guns….

  • eMtoN


  • Bran D

    I might get one just for how mind blowingly cool it is.

  • Me

    Should also work for d3 and d8. In any case, imagine having to roll 40 at once(and then do the calculations) in a game of 40k.