NUMBERCADE

Math practice
backed by science.

Targeted practice for the foundational skills that trip kids up most, from fractions to pre-algebra.

▶ Play free

Covering the core skills kids need most

Number fluency • Fractions & percents • Order of operations • Equations • Slope • Geometry • Roots & exponents • Probability

From the founder

The Math Cliff

Around fourth grade, math takes a sharp turn, from concrete arithmetic to abstract ideas like fractions and probability. Standard curriculums are forced to move so fast that kids get rushed past these concepts before they truly master them. This is exactly when so many students lose their confidence and fall off the "math cliff." As a parent, I watched it happen.

As a PhD economist who spent years evaluating the rigor of education and labor policy research, I knew it did not have to be this way. There are decades of solid research on how kids actually learn math best, but it is buried under a mountain of noise. I built Numbercade to be the bridge: a science-backed, genuinely engaging tool that helps kids lock in the foundations, build confidence, and lay the groundwork for future success in STEM.

Dara, founder

Not worksheets. Not drill apps.

Cognitive science and behavioral economics,
applied to where kids actually get stuck.

Frees up working memory Multi-step problems demand working memory. If a kid is still burning mental energy recalling basic facts, they redline before they reach the actual logic. Interleaved practice automates those retrieval paths so the brain can do the real work.
Eliminates math anxiety Worksheets are a negative loop: wrong answer, bad feeling, shut down. In a game, a wrong answer is just a retry. Failure becomes a mechanic, not a verdict. Kids stay in the seat.
Research, not trends Curriculums change every few years. The cognitive science of how kids learn math does not. Numbercade is built on that science. Every section layers on the last to build intuition, not just correct answers.

Every game targets a core skill.

Fluency, fractions, equations, slope, geometry, exponents, probability. Start anywhere, play in any order, and jump back whenever something wobbles.

▶ Enter the arcade

Grades 4 to 8. Free. No account needed to play.

Get started

Three steps. That's it.

1
Pick your player
One grown-up email makes the account. Kids get profiles with nicknames and an emoji avatar. That's all the personal info there is.
2
Start where it wobbles
Jump into the game that targets your weak spot.
3
Watch mastery build
Short sessions, spaced practice. The meter fills as concepts lock in.

The whole arcade is free.

No account · No paywall · No ads · No catch

Runs in your browser. No app to download. No credit card to enter. Just pick a game and play.

▶ Play free
Questions parents actually ask

FAQ

Is it really free? What's the catch?

Yes, really. All eight games, every world, no ads, no paywall, no in-app purchases, and nothing to buy. No trial, no locked preview, nothing that expires.

Is this a full math curriculum?

No, and it's not trying to be. School (or your homeschool curriculum) covers the waterfront. Numbercade is targeted reinforcement for the eight skill areas where kids most often fall off the cliff: number fluency and negative numbers, equations, fractions/ratios/percents, order of operations, linear equations and slope, geometry, roots and exponents, and probability. Think of it as the climbing gym, not the mountain.

Does this help with test prep?

It helps with the part of test prep that transfers. The eight skill areas the games teach are the underlying concepts tested by admissions tests such as the ISEE and SSAT, and many practice items were modeled on the kinds of questions those tests actually ask. But Numbercade is not a test-prep product, and we are not affiliated with or endorsed by any test maker. The emphasis is understanding math concepts through methods grounded in rigorous research. A kid who genuinely understands slope, fractions, and probability walks into any test with the one thing a cram course can't shortcut. And if you are specifically prepping for the ISEE, that is a different job: we build a tool for exactly that, with real ISEE-style practice at ISEE Coach.

Isn't this just more screen time?

It's fifteen minutes of screen time with a job. Sessions are short by design, there's no infinite scroll, no autoplay, and no mechanic engineered to keep kids on past the lesson. The game literally tells kids to grab scratch paper. When the session's done, it's done.

Which grades is it for?

The sweet spot is grades 4 to 7 (roughly ages 9 to 12). A strong third grader can start with the earlier worlds; an eighth grader shoring up algebra basics won't feel babied. The games never mention grade levels, so nobody feels behind.

What devices does it work on?

Any modern browser: laptop, Chromebook, tablet, or phone. Nothing to install, nothing to update, no app store account. If it can load a webpage, it can run the arcade.

What about my kid's privacy? Are you COPPA compliant?

We designed for compliance by collecting almost nothing: one parent email for the account, kid profiles that are just a nickname and an emoji. No ads, no trackers, no data sales, and game progress lives on your device. Parents create and control all profiles.

"Research-backed" gets said a lot. What does it mean here?

Fair question, because that phrase can mean two different things. Meaning one: the product itself was tested in studies. Meaning two: the product was designed from practices that were tested. Most companies blur the two; we think you deserve to know which one you're buying. Numbercade is meaning two: the games were designed around findings from randomized trials and the Department of Education's practice guides, and each game includes a "The Research" page listing which mechanic implements which recommendation, with citations. In the federal ESSA evidence-tier system, that makes us Tier 4, Demonstrates a Rationale: a research-anchored design plus a public plan to study our own effects. It does not mean this product itself has been through a trial. We'd love the opportunity to collaborate and test the impact of the product in an RCT.

Do you have a school or classroom version?

Not yet. It's on the list. Teachers who want to pilot it anyway: email us, we like you.