Play Online Math Lines (Subtract to get 4)
You know that satisfying click when everything just… disappears? That’s the magic of Math Lines (Subtract to get 4). You start with a string of numbered balls snaking across your screen, and your job is to launch new numbers into the mix. The catch is that you’re not matching colors or shapes—you’re hunting for subtraction pairs. When two balls next to each other have a difference of exactly four, poof—they both vanish.
It’s shockingly simple at first: see a 9 and a 5, shoot your next ball to bring them side by side, and watch your score hop up. But as the chain grows longer and curves around obstacles, you’ve got to think a couple shots ahead. Do you clear a tight cluster now or hold off, hoping a later ball will give you a bigger combo? Every hit counts because that chain is inching forward.
One of the coolest things is how it quietly teaches mental math without feeling like homework. You aren’t memorizing tables, you’re doing quick subtractions on the fly—like a ninja of numbers. And when you pull off a multi-pair clearance and see those balls vanish in rapid succession, it’s motivation enough to keep chasing a better score.
It’s easy to lose track of time when you’re steering that little numbered orb. Between the gentle hum of background music and the satisfying clink of disappearing balls, you’re addicted to one more round. Before you know it, you’ve sharpened your subtraction skills and had a blast doing it.