Rolls two dice from opposite sides, adds their top faces, and stacks one more count onto the 2-to-12 bars already built from 24 hidden rolls, so a distribution tall in the middle keeps growing. — demo

Rolling

Rolls two dice from opposite sides, adds their top faces, and stacks one more count onto the 2-to-12 bars already built from 24 hidden rolls, so a distribution tall in the middle keeps growing.