Parts of a whole, and how they compare. Four published boards so far: one that does not let anybody off simplifying, two where the only fraction that matters is a half, and one made only of fractions with a 1 on top.
Fractured Fractions cuts a picture with a single point and asks that every piece come out holding the fraction written on its card. The pieces show what they actually are — 7/21, 10/15, 30/72 — and the cards say 1/3, 2/3, 5/12, so the only road from one to the other is reducing. The harder packs never show a rectangle already wearing its answer in lowest terms. Voronoi Islands shares an island out by distance, and whoever ends a turn holding less than half of it hands the other side a point, so the share written over the board is the whole score, and 49.9% is not enough. Underdog asks for more than half twice over: a rectangle of voters goes to the side holding more than half of it, and the dogs, fewer than the cats, need more than half of the rectangles. Three dogs of six is only a tie. Eye of Horus fills a circle with slices that each have a 1 on top, a third, a quarter, a twelfth, until they make exactly one whole, and no slices side by side may add up to one slice: a quarter beside a twelfth is out, because together they are a third. More fraction boards are built and in testing; they reach this shelf one at a time, when they are good enough to keep.