Privacy Policy

InfiniGrid (InfiniGrid) · Last updated 7 July 2026

This policy explains what information is collected when you use InfiniGrid — the Sudoku game at play.infinigrid.org and the website and API at infinigrid.org — and how it is used. Playing the game does not require an account.

Information we collect

Game data stored on your device. Your puzzles, saved games, move history, and settings are stored locally in your browser (localStorage). This stays on your device and is not sent to us.
Technical & error data. We use Sentry for error monitoring, which may collect technical details such as your browser type, device information, IP address, and details of any errors, to help us fix bugs.
Advertising data. We show ads via Google AdSense. Google and its partners use cookies and similar technologies to serve and measure ads — these may be personalized based on your prior visits to this and other sites.
API sign-up (optional). If you request an API key, we collect your name and email address and process them through Stripe (billing), Zuplo (API key issuance and usage limits), Cloudflare Turnstile (bot protection), and Resend (sending your welcome email).

Cookies & advertising

Third-party vendors, including Google, use cookies to serve ads based on your prior visits. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this and/or other sites.

You can opt out of personalized advertising:

Google Ads Settings: adssettings.google.com
Opt-out tools: aboutads.info/choices and youradchoices.com
Learn how Google uses data: policies.google.com/technologies/partner-sites

Third-party services

We rely on these providers, each with its own privacy policy:

Google AdSense — advertising
Cloudflare — hosting, and Turnstile bot protection on sign-up
Sentry — error monitoring
Stripe — payment processing (API plans)
Zuplo — API key management
Resend — transactional email

Your choices

Clear the game's saved data at any time by clearing your browser's site data for this site.
Opt out of personalized ads using the links above.
Decline the optional API sign-up if you don't want to share your name and email.

Children

InfiniGrid is not directed to children under 13 (or the minimum age in your country), and we do not knowingly collect personal information from them.

Changes to this policy

We may update this policy from time to time. Material changes will be reflected by updating the "Last updated" date above.

Contact

Questions? Email support@infinigrid.org.

This page is provided for transparency and does not constitute legal advice.