BorderWidthMatch is a visual pairing game about outline weight. Multiple flat shapes appear with either thick or thin borders, and you must tap two whose border thickness matches exactly to clear them and score. Pair shapes with different thicknesses and you earn a mistake. Three mistakes end the run. Early rounds keep thick and thin borders easy to tell apart, but higher scores shrink the width gap until outlines look nearly identical. Compare stroke weight carefully, ignore fill color alone, and commit only when both borders truly match. It rewards patient inspection as thickness differences grow subtler over time.