Do I need to create an account?

No. Every Number Duel game runs without an account. There is no email field, no password, no social login, no phone verification. Open the site and you are playing in seconds.

What personal information do you collect?

Number Duel does not collect personal information. There is no account system, no email capture, and no analytics that can identify individual users. The Cloudflare Web Analytics beacon counts page views in aggregate only.

Is this safe for my child?

Yes. There is no chat, no social features, no user-generated content, and no third-party advertising. The games are completely self-contained in the browser, and your child cannot accidentally share personal data because there is no place to enter it.

Where is my progress saved?

Your best scores and personal statistics are saved in your browser's local storage on the device you are using. They never leave your device, and they are deleted if you clear your browser data. There is no cloud account to lose access to.

Number Duel Games

Math Games No Sign Up

Most "free" game sites put a sign-up wall in front of their games. You want to play for 2 minutes, but first you have to create an account, verify your email, set a password, and agree to a terms of service. Number Duel does the opposite: there is no account system at all. Open the page, click a game, and you are playing. It takes less than five seconds from page load to first move.

Play Number Duel now →

Why No Sign-Up Matters

The sign-up wall exists on most game sites because the site needs an account to track your progress, sell you upgrades, or build a marketing list. None of those apply to Number Duel:

Progress is saved locally. Your best scores and statistics live in your browser, not on our servers. There is nothing to sync, nothing to lose access to if we shut down.
There is no paid tier. Every game is fully free, with no premium features locked behind an account.
There is no email list. We do not need your email because we do not send marketing emails.
There is no marketing funnel. You came to play; we let you play. That is the whole deal.

What This Means for Privacy

Without an account, there is no user profile, no login history, no IP-based tracking of your activity, and no behavioral data being sold to advertisers. The site does load a single Cloudflare analytics beacon, which counts page views in aggregate. It does not collect any information that could identify you or your device.

What This Means for Parents

If you are a parent, "no sign-up" also means "no email field for your child to type into." There is no place on the site where a child can enter personal information, intentionally or by accident. This is especially important for younger students who might be tempted to fill in a name field with their real name. On Number Duel, there is no field to fill in.

What This Means for Teachers

If you are a teacher assigning a game to your class, the no-account design means:

No FERPA paperwork to file for student accounts.
No parental consent forms for online services.
No risk of students creating accounts with school email addresses.
No data retention concerns if a student leaves the class.

You can send the link to a student, a class, or a parent with no privacy review required. The site collects nothing that would be subject to student data privacy regulations.

How to Save Your Progress

Your best scores and personal statistics are saved in your browser's local storage. They will be there the next time you visit the site on the same device, using the same browser. If you switch devices, the scores do not transfer — by design. There is no cloud account to back them up, and no way for the data to leak. If you clear your browser data, the scores reset. That is the trade-off for the no-account design, and most players find it fair.

For 1v1 Play with a Friend

The friend room system also works without accounts. To play against a friend, generate a friend room link from the homepage and send it to them. They open the link, choose a side, and you are matched. No logins, no friend lists, no friend codes. Just a URL.

Frequently Asked Questions

Will my scores be on a leaderboard? No. There is no global leaderboard, no public profile, no way for other players to see your scores. Your numbers stay on your device.

Do you have a mobile app? No. The site works on mobile browsers, and adding it to your home screen as a Progressive Web App gives you an app-like experience without the app store friction.