Label the Hidden Set

Graded against a hidden key. You need 9 of 12.

Twelve pieces of fruit, each described by colour, weight, skin and what sits on top. Each one is an apple or a tomato. You do not get their answers, and you never label them by hand: you build one rule and the app applies it to all twelve.

Build your rule in the top panel. The eight practice rows underneath have their answers showing, and they re-score every time you change a clause. Get your rule as good as you can there, then apply it to the twelve and submit.

Two of the twelve sit on the boundary on purpose, so expect to miss one or two. That is what a boundary is.