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Dice with 2, 4, 6, 8, 10, 12, and 20 sides are a useful but incomplete family...
Here are the missing dice to help you build new gaming systems!
A D16 made as a Dual D6/D6. The outer shell has 0, 1, 2 or 3 pips on the vertices. The inner die has 0, 3, 6, 9, 12 or 15 pips (grouped by 3 for a better reading) on its faces.
The maximum score of the dual die is the product of the number of faces of the internal die by the maximum number of dots on one face of the external die.
Add the pips shown on the vertices of the upper face of the outer shell to the pips shown on the upper face of the internal die to get the result of the D18.
This die is fair without being a trapezoedron.
Note that you will have to use a cutter to remove the pegs so that the white dots will appear.