Do I need to download anything to play?

No. Number Duel runs entirely in your browser. There is no installer, no app to download, no plugin to enable. Open the website, click a game, and start playing.

What devices and browsers are supported?

Any modern browser on any device: Chrome, Firefox, Safari, Edge, Samsung Internet. Phones, tablets, laptops, and desktops all work. The site uses standard web technologies (HTML, CSS, JavaScript) and has no special requirements.

Do browser games work offline?

After your first visit, the browser caches the files needed to play, so the games will start to work offline. Some features, like the friend room system, require a network connection.

Are browser games slower than downloaded games?

For casual puzzle and strategy games like Number Duel, no. Modern browsers run JavaScript fast enough that you cannot tell the difference. For high-end 3D games, a download is still better, but for math puzzles, browser is the right choice.

Number Duel Games

Math Games No Download

Every game on Number Duel runs in your browser. There is nothing to install, no app store account needed, no plugin to enable, and no system permissions to grant. Open the site, pick a game, and you are playing in under five seconds. It works the same on a school Chromebook, a work laptop with restricted software installs, a family tablet, and your personal phone.

Play Number Duel now →

Why Browser-Based Is the Right Choice for Math Games

Most "free math games" sites require you to download an executable, install a mobile app, or sign up for a subscription. Number Duel does none of those. The game is just a webpage. That has three big advantages:

It works on restricted devices. School Chromebooks, work laptops with locked-down installers, library computers — they all run a browser. They do not all let you install software.
It is always the latest version. There is nothing to update. When we ship a new feature, the next time you load the page, it is there.
It works across devices. You can start a game on your phone on the bus, finish it on your laptop at home, and pick up where you left off. No device lock-in.

What Runs in the Browser

Number Duel is built with standard web technologies: HTML for structure, CSS for styling, and TypeScript for game logic. There is no Flash, no Java applet, no Silverlight, and no WebAssembly blob. The site loads in a few hundred milliseconds and the game logic is fast enough that the only constraint on play quality is the player's own decision speed.

Games You Can Play Without Downloading

Sum Duel — 1v1 addition strategy. Play →
Product Duel — 1v1 multiplication strategy. Play →
Fifteen Duel — make-15 tic-tac-toe variant. Play →
24 Game — arithmetic brain teaser. Play →
Sudoku for Kids — 4x4 and 6x6 grids. Play →
KenKen — arithmetic logic puzzle. Play →
2048 — sliding number puzzle. Play →
Mental Math Test — 60-second speed drill. Play →

For Schools and Libraries

The "no download" requirement is especially important in school and library settings. IT administrators do not have to install or whitelist a specific executable. As long as the browser is allowed, the games work. The site also serves over HTTPS, does not request microphone or camera access, and does not run any third-party scripts beyond the analytics beacon.

Performance and Loading

First load takes about a second on a typical broadband connection. After that, the browser caches the assets and the site starts nearly instantly. The site is also designed to be lightweight: the entire 1v1 game, including board, controls, and bot AI, fits in a few hundred kilobytes of code. That is smaller than a single photograph on most webpages.

Frequently Asked Questions

Will the games work on my old computer? Probably. The site does not require a recent processor or graphics card. Any device that can run a modern browser (released in the last 5-7 years) can run Number Duel.

Do I need a fast internet connection? No. The site is small enough that even a slow connection loads it in a couple of seconds. After the first visit, most of the assets are cached locally, so the games will start to work even on a flaky connection.