Based on that picture, the d30 is not platonic, since its faces seem to be rhombus-shaped. (And since there is no thirty-sided platonic solid.)
Our dark lord and master Cthulhu commands us all to use non-Euclidean dice, of course. It’s impossible to figure out what you’ve rolled, and they drive you crazy if you even look at them! Bwahahahahahaha!
But you could easily add three more rolls and use a d20 e.g. rolling an 18-19 = 17 years old; rolling 20 = DM choice.
Also there’s quite a difference between a 1 year old and a 16 year old - has the DM prepared for both possibilities?
P.S. Hi, What Exit?
Sure. Just imagine a spindle with rectangular faces instead of triangular. True, you’d have an edge facing up instead of a face, but that’s easily solved by marking the numbers into the sides, like a d4.
I remember when I first started playing D&D at age 11 or 12, we couldn’t figure out the 4-sided die, so we did something stupid like try to read the left-most number on the side that faced the person who rolled.
Hmm, in my world, 14 is the age of majority among many social classes. I suppose I could have a noble die, a guilded freeman die, an unguilded freeman die, and a serf die.
Of course, if I get pissy enough, they all die!
Non-symmetric dice like the d5 can never be completely fair: You can empirically get it pretty close to fair, for “normal” rolls, but things like how hard you throw the die and the surface you’re rolling on can cause a bias one way or the other. Thus, for instance, a d5 which is proportioned to roll fair on a wooden tabletop might not roll fair when rolled on a mousepad. The d100 has the same problem, though nobody ever notices it.
The d30 isn’t a Platonic solid, but it has exactly the same set of symmetries as a d12 or d20. It bears the same relationship to them as the rhombic dodecahedron bears to the cube and octohedron.
For other fair numbers of faces (not counting spindle dice, which you can find for any even number), you can make:
d4
d6
d8
At least three different kinds of d12: One with pentagons, one with rhombi, and one with isocoles triangles
d20
At least three different kinds of d24: Two with isocoles triangles, and one with kite shapes
d30
At least two different kinds of d60, both with isocoles triangles (one obtuse and one acute)
d120, with triangular faces of no particular symmetry
Actually, I think they were 14-sided, sort of football (as in soccer) shaped, but with all faces the same (not pentagons and hexagons). I’ll see if I can find it over the weekend, but this thread may have died by then (or, more likely, I’ll forget).
In the interests of fighting ignorance, the Platonic solids are convex regular polyhedrons. There are five and only five such solids:
[ul]
[li]Tetrahedron - d4[/li][li]Cube - d6[/li][li]Octahedron - d8[/li][li]Dodecahedron - d12[/li][li]Icosahedron - d20[/li][/ul]
Dice made in these shapes will be fair but, as previously noted, these are not the only fair shapes.
If by a “spindle dice” you mean a prism with a pyramid on each end, with proportions so that it’s not stable on the triangular faces, but only on the rectangular faces (e.g., a pencil sharpened at each end), why can’t it have any number of faces from three upwards?
And so for a d17, you have a solid with 17 rectangular sides (all equal) and 34 triangular sides (also all equal), which won’t come to rest on a triangular side, because it would immediately tip over.
kinda off topic but when I was look for free Table Top Role Playing games I found this: http://legendaryquest.com/ It uses a 30 sided die as the major die of the game. I bought one before I decided that it was too complicated to use as my first RPG. (so now Im using the simplest gaming system in the world: RISUS)
I learned the hard way that a bunch of gamblers do not like hearing shooting craps referred to as “rolling 2d6.” Then again, it may not have helped that I was betting dark side on a cold table.
Serious question: Has anyone ever made a dice gambling game that uses anything besides Xd6?
You’re welcome to play in my craps game that uses 2d20. Warning: The odds favor the house.
There’s this ancient Roman d20 that was recently auctioned by Christie’s. It’s unknown what game the die was used for, but it wouldn’t surprise me if it were used for gambling.
Some creative Googling has lead me to this column about Fair Dice. It suggests that one can make fair dice with sides 2n. Aside from the familiar shapes (including d10), the d14, d16, and d24 are also available. You can also get the d3, d5, and d7. Here’s one site that sells them.
Quoth Giles:
Actually, I meant “two pyramids attached base to base, possibly skewed to kite-shaped sides”, like the d10. Strictly speaking, the cube and octohedron also fall into this category, but they’re both more symmetric than that, so deserve special consideration. An end-capped prism or a dreidle can be made for any number of sides, but it feels a little like cheating to me to have sides on the die that it can never land on (or at least, never stay on if it does land on them).
So…has anyone besides me ever made any 32-sided dice?
Nitpick: Such dice will be geometrically fair, but might still have some trickery built into them, (uneven weighting, certain faces being more adhesive than others etcetera,) that might bias them. I’ve seen a long list of the way that craps dice can be ‘fixed’, and most of them would apply to all other platonic solid dice, or all dice in general, I think.
And can a mismarked die, (say, a d6 with sides marked as 4, 5, 6, 4, 5, 6) be considered ‘fair’ if there are no other issues with it? Each side has an equal chance of coming up, but not all of the results expected have any connection with the sides of the die.
Sicherman dice, which will roll 2-12 with the same distribution as regular dice.
I’ve made non-dice (ornamental) buckyballs before. Lots and lots of tape.
I don’t think they’d be fair dice, since the twelve pentagons have lower surface area than the twenty hexagons; your odds of rolling an individual hexagon would be slightly higher than an individual pentagon. Though I’m sure you can fudge around this by rounding off the edges of the hexagons more than the pentagons, it’d be more work than I’d want to do.
Me, when I need 1d32, I roll 1d4-1 and 1d8-1 then convert from octal to decimal and add 1. 
Another question: 2D6 (36 combinations) is handy for rolling random alphanumeric characters, but is there any way to mark the dice for a readable result, without having to resort to a lookup table?