From Cubicle 7's Doctor Who RPG, Players Guide page 6.
"You’ll have no doubt seen the small cubes with dots or numbers on them that you have in copies of Monopoly, Risk or Ludo. Anyway, those cubes are six-sided dice (cause they have six sides)."
Your game is aimed at intelligent kids who are fans of geek TV drama. There's absolutely no need for this level of talking down to people.