The bazaar's weigh-house. A chit comes over the counter with the lot as a column and no total; hang brass until the beam just tips, then stamp the docket. A level beam is not a reading, so the weight you write is one under the brass. Steel struck in a rhythm shears. No clock.
The pack suggests age 7 and up. The difficulty itself follows the player, not the age.

THE STEELYARD draws its questions from these parts of the curriculum. Which of them a player sees, and how hard the questions are, follows the player.