A math adventure a class can open in a browser.
A child washes up on an island with nothing and builds it back, and the math is how. Counting stacks the logs. Sharing splits the firewood. Multiplication plants the garden in rows.
Nothing to install, no account to create, and no email address collected from a student.
Players under 13 see no ads at all and are never shown a sign-in.
A real frame from the game. The question arrives inside work the child was already doing.
For teachers and schools
Runs on the devices you already have
No install, no signup, and no licence to arrange before a class can try it.
Open it in a browser and start
The full game runs in any modern browser at mathempire.app/play/. There is nothing to install, no account to create, and no email address to collect — from a teacher or from a student. It loads on Chromebooks and on managed school devices where installing software is not an option.
A class can try it in a minute
Type the URL on the board and the class is playing. A student can pick the same game up again at home on any device without anyone signing in, because progress is kept under an anonymous save key rather than an account.
The math is the mechanism
Chopping, mining, fishing, foraging, crafting and building are each made of math. Counting is how the logs get stacked; sharing out is how the firewood gets split; multiplication is how the garden gets planted in rows. It is not a quiz with a theme painted over it.
Nothing is taken away for a wrong answer
The picture of the problem comes back, the mentor names the thinking that went sideways, and the student tries again. Nothing is deducted, nothing is ended, nothing is locked. There is no combat anywhere in it and no countdown on the island.
What it teaches
Twelve islands, one per grade band
Each island’s math domain is built into how that island works, rather than themed on top of a quiz.
| Island | Grades | Math domains |
|---|---|---|
| 1 · The First Shore | 1–2 | Counting, addition and subtraction to 100, place value |
| 2 · Isle of Groups | 3 | Multiplication and division |
| 3 · Isle of Broken Bread | 3–4 | Fractions |
| 4 · Decimal Harbor | 4–5 | Decimals, money, measurement |
| 5 · The Geometer’s Isle | 5–6 | Area, perimeter, angles, volume |
| 6 · Isle of Ratios | 6 | Ratios, percent, proportion |
| 7 · The Tide Isles | 6–7 | Integers, the coordinate plane |
| 8 · The Forge of Unknowns | 7–8 | Expressions, linear equations |
| 9 · Algebra Archipelago | 8–9 | Algebra I: slopes, systems, quadratics |
| 10 · The Proof Temples | 9–10 | Geometry: congruence, similarity, Pythagorean theorem, introductory trigonometry |
| 11 · Isle of Functions | 10–11 | Algebra II: polynomials, exponentials, logarithms, trigonometric functions |
| 12 · The Navigator’s Sea | 11–12 | Pre-calculus, introductory calculus, statistics |
The practice room
Alongside the adventure there are 29 practice modes across 12 worlds, from counting and times tables through fractions, algebra and trigonometry, with word problems mixed into the basic operations. Every topic opens with an animated worked example that shows the method before asking for an answer, read aloud for the youngest readers.
Held at the right difficulty
Facts a student stumbles on come back sooner; facts they own come back later. The game aims at roughly four right in five — the band where a child keeps going instead of closing the app — and it adjusts in both directions as they do.
Placement without a test
An older student who starts late is not marched through grade 1. A placement quiz can start a learner at any island, with the earlier facts seeded into their review schedule so the gaps still get filled.
One learner profile
The island adventure and the practice room share the same record of what a student knows. Practise multiplication at the study table and the island already knows it.
From the game
What a session looks like
Captured from the build that is live right now — not concept art.
Following a class
Classroom codes and a class view
Free, on the web, in ten seconds: mathempire.app/teacher. No account to create.
- Name your class and you get a join code like MATH-KING-4821, and a board link (mathempire.app/play/?class=CODE) that opens the game with the code already filled in.
- Students type the code, say what you should call them, and play. No student accounts, no email addresses.
- Your class page shows the roster with safe names, sums right, points this week, accuracy, streak and mastery by fact family – and for the class, who was active this week, the hardest fact family, who improved most and who is worth a look. Download a CSV any time.
- Joining stores, against your class, the name the student typed, their grade and those numbers – nothing else. Remove a student from the roster yourself, or ask us on the support page.
Two things worth knowing before you plan around it
It is one page and one key. Your class page remembers you in the browser you made it in, and gives you a private link to open it on another device. Keep that link to yourself: it is your key, and there is no password to reset.
Island one is much the most developed. All twelve islands are in the game and each has its story written, but the first has the full arc, an ending, and a hundred and thirty-five things to find. Islands two and up are shorter. If you are trying it with a class, island one is what to judge it on.
Students, safety and data
What students see, and what they do not
- Players under 13 see no advertising of any kind — not a banner, not a video, and not the offer of one.
- Under-13 players are never shown a sign-in and are never asked for an email address.
- There is no chat, no messaging and no profiles. There is no way for anyone to contact a student through the game.
- Nothing is deducted or locked for a wrong answer, and there is no combat in the game.
- Ads shown to players 13 and over run without an advertising ID — the Android advertising-ID permission is removed from the app. The optional upgrade removes those ads.
What we collect from a student, and what we do not
This page used to say we collected no personal data from children. That was wrong, and it is corrected here. What follows is what the code actually does.
- In a browser, a student is asked for no name, no email address and no sign-in. Progress is kept on the device and backed up to our server under an anonymous random save key, so a cleared browser does not have to mean lost work.
- In the Android app, the first question is what year the player was born, and the answer stays on the device. If it is under 13 — or if the question is declined — no sign-in is ever offered, so we never hold an email address for that player. Progress moves between devices with an anonymous Player Code.
- A player 13 or over may choose to sign in with Google. If they do, we hold the email address and the name on that Google account. Anyone who signed in before the age question existed still has an email address and a name stored with us.
- For every player we store the display name they type into the game, their progress and their mastery record, and a two-letter country code derived from the connection. That is what makes a lost device recoverable and the leaderboard possible.
- We use Google Analytics for Firebase and crash reporting to see which screens are used and to receive crash reports. Those are Google services and that data goes to Google; it includes the grade and the gender a player selected.
- Deletion is not all-or-nothing yet, and we would rather say so. The in-app button (Settings → Delete my account and data) removes the account record, saved progress, mastery data and feedback straight away. Usage events, classroom membership, error diagnostics and the island adventure’s separate save are removed by hand when you email us. Crash reports are held by Google under Google’s own policy and we cannot delete them from here.
The full list, and both routes to having it removed, are on the support and account-deletion page and in the privacy policy. A parent or guardian can send that request for their child.
Cost
Every topic and every island is free. There is an optional upgrade that removes ads for players 13 and over and adds coins and cosmetic items; it buys nothing academic, and no part of the curriculum sits behind it. Purchases go through Google Play.
Questions
Asked often
Is it really free for a classroom?
Yes. Every island and every practice topic is free, in the browser and in the app, with no class licence and no per-seat cost. The optional upgrade removes ads for players 13 and over and adds coins and cosmetic items — it unlocks no curriculum.
What ages is it for?
Kindergarten through grade 12, plus an adult mode — roughly ages 5 to 18 and up. The practice room starts at kindergarten; the island adventure begins at grade 1 and its twelfth island reaches pre-calculus. The Google Play Store rates the app Everyone.
Do my students need accounts?
No. In a browser nobody is asked to sign in at all, and in the app a player under 13 is never shown a sign-in and is never asked for an email address. Progress travels on an anonymous Player Code instead.
That is not the same as collecting nothing. The display name a student types, their progress and their mastery record are stored on our server so a lost device does not mean lost work. What is kept, and how to have it deleted, is set out above and on the support page.
What data do you hold about a child, exactly?
For a student playing in a browser: an anonymous random save key, their progress and mastery record, and a country code derived from the connection. No name is requested, no email address, no sign-in.
For a student in the Android app: the same, plus the display name they type and — only if they are 13 or over and choose to sign in with Google — the email address and name on that account. Google Analytics for Firebase and crash reporting also receive screen views, crash data and the grade and gender selected in the app.
If a student joins your class with a code, the class record additionally holds their display name, grade level and mastery data, which is what the roster and the class figures are made of.
Can I see what my class is doing?
Yes, in the Android app. Open a class, hand out the join code, and the class view shows the roster along with how many students were active this week, problems solved, average accuracy, the hardest topic for the class, and who has improved most. It is free.
What does not exist yet is a web version of that view, so following a class needs the app on a device even though students can play in a browser. Nothing is served from this address today except this page. The form below is how to hear when the web dashboard is ready.
Does it work on Chromebooks and iPads?
The browser version runs on both, and on anything else with a modern browser — that is the version to use on a managed school device. The installed Android app adds offline play; the practice room and the first island need no connection, and later islands fetch their scenery once and keep it. There is no iOS app yet.
How do I set a class up?
For a browser class, there is nothing to set up: put mathempire.app/play/ on the board.
To follow progress, install the free Android app on your own device, open a class, and give students the join code to enter in their copy of the app.
What is coming next?
More of the island’s own story, spoken voices for the characters, and the web teacher dashboard. Progress, purchases and saved work carry across every update.
Hear when the web dashboard is ready
One list. We will write when the web teacher dashboard or an iOS app exists, and not otherwise. Nothing is gated behind this — the game is already free to open in a browser.
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© 2026 Math Empire · Published by Rise In Rank LLC
A cozy math adventure for kindergarten through grade 12, free in a browser and free on Google Play.