Privacy Policy

Last reviewed on: April 23, 2026

Introduction

This Privacy Policy describes how Sudoku365 ("we", "us", "the site") handles information when you visit sudoku365.com. The site publishes Sudoku puzzles and educational content about Sudoku solving. We do not sell personal information and we collect only what is necessary to keep the site running, understand traffic, and display advertising that supports free access to the content.

Information We Collect

Information You Provide

No account or registration is required to use Sudoku365. If you contact us by email, we receive whatever information you choose to include in that message — typically your email address, name (if you share it), and the body of your message.

Automatically Collected Information

When you visit the site, standard server logs and analytics tools automatically record technical information, including:

IP address (often truncated or anonymised)
Browser type and version
Operating system and approximate device type
Pages visited and time spent on them
Referring website (if any)
Date and time of visit

This information is used for diagnostics, to prevent abuse, and to understand which content is useful to readers. It is not combined with any personally identifying account data, because the site has no accounts.

Cookies and Similar Technologies

Sudoku365 and the third-party services described below use cookies and similar browser storage. Cookies are small text files saved by your browser. They are used for:

Preferences: Remembering your choice of dark or light theme and your current puzzle progress. This data is stored in your browser using Local Storage, which is not transmitted to our servers.
Analytics: Understanding how visitors use the site so we can improve it.
Advertising: Serving and measuring ads, including the option for personalised advertising where permitted.

You can control or delete cookies at any time from your browser's settings. For a detailed breakdown of each category of cookie in use, see the Cookie Policy.

Google Analytics

Sudoku365 uses Google Analytics to understand aggregate site traffic. Google Analytics uses cookies to collect information such as page paths, session duration, and approximate geographic region. Data is processed by Google under its own privacy terms. See Google's Privacy Policy and Google Analytics data-collection information for details.

You can opt out of Google Analytics tracking by installing the Google Analytics opt-out browser add-on.

Advertising and Google AdSense

Sudoku365 uses or intends to use Google AdSense to display advertisements. Google is a third-party vendor whose use of cookies allows it to serve ads based on a user's prior visits to this and other websites.

Google, as a third-party vendor, uses cookies to serve ads.
Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this site and other sites on the internet.
You may opt out of personalised advertising by visiting Google Ad Settings.
You may also opt out of many third-party vendors' use of cookies for personalised advertising at www.aboutads.info/choices and, for users in Europe, at youronlinechoices.eu.
For Google's ad practices in more depth, see How Google uses information from sites or apps that use our services.

If you are visiting from a region that requires consent before non-essential cookies are set (for example, the EEA, UK, or Switzerland), Google's consent mechanism will ask for your preferences before personalised advertising cookies are used.

Third-Party Vendors

The site works with the following categories of third parties:

Hosting and content delivery: Standard static hosting; receives request logs.
Analytics: Google Analytics (Google LLC).
Advertising: Google AdSense (Google LLC) and its advertising partners.

These providers process data under their own privacy policies. We do not share personally identifying information with advertisers beyond what Google's standard ad-serving cookies collect automatically.

How We Use Information

To run and maintain the site.
To detect and prevent abuse, fraud, and technical problems.
To understand how readers use the site in aggregate, so we can improve it.
To display and measure advertising that funds free access.
To respond to your inquiries when you email us.

We do not sell your personal information. We do not build user profiles for our own direct marketing.

Data Retention

Server logs: retained for a limited period (typically up to 90 days) for security and diagnostics, then deleted or anonymised.
Analytics data: retained according to the current Google Analytics retention settings, which may be adjusted over time to the minimum period needed.
Advertising data: retained by Google and its partners according to their own policies.
Email correspondence: kept as long as reasonably necessary to provide support or keep a record of the exchange.
Browser Local Storage: stays in your browser until you clear it.

Children's Privacy

Sudoku365 is suitable for general audiences, including children. The site does not knowingly collect personal information from children under 13 (or under 16 where applicable by local law). If you believe a child has provided information, please contact us so we can remove it.

Note that some third-party advertising cookies may still be set on pages viewed by users of any age. Where required by law, such as in the case of child-directed content, we will take reasonable measures to limit personalised advertising.

Your Rights (GDPR)

If you are located in the European Economic Area, the United Kingdom, or Switzerland, you have rights under the General Data Protection Regulation (GDPR), including:

Right of access to your personal data.
Right to rectification of inaccurate data.
Right to erasure ("right to be forgotten").
Right to restrict processing.
Right to data portability.
Right to object to processing, including for profiling and direct marketing.
Right to withdraw consent at any time where processing is based on consent.
Right to lodge a complaint with your local data protection authority.

To exercise any of these rights, contact us using the details at the bottom of this page.

Your Rights (CCPA/CPRA)

If you are a California resident, you have rights under the California Consumer Privacy Act and California Privacy Rights Act, including:

The right to know what personal information is collected and how it is used.
The right to delete personal information we hold about you.
The right to correct inaccurate personal information.
The right to opt out of the "sale" or "sharing" of personal information, including the use of personal information for cross-context behavioural advertising.
The right to non-discrimination for exercising any of these rights.

We do not sell personal information for money. To opt out of personalised advertising, use Google Ad Settings and aboutads.info/choices as described above, or contact us.

Security

The site uses HTTPS for all pages. Reasonable administrative and technical safeguards are used to protect the limited data that passes through the site. No method of internet transmission or storage is perfectly secure, so we cannot guarantee absolute security.

International Transfers

Sudoku365 is available worldwide. Some third-party services used by the site (including Google's) may store or process information in countries other than your own, including the United States. By using the site you acknowledge that such transfers may occur.

Changes to This Policy

We may update this policy as the site evolves or as the law changes. The "Last reviewed on" date at the top of the page indicates the most recent revision. Material changes will also be noted on the homepage for a period of time.

Contact

Questions about this Privacy Policy or a request relating to your rights can be sent to:

Email: [email protected]

Please include enough detail to identify the request (for example, the date range or the type of data involved). We aim to respond within a reasonable period, and within the timeframes required by applicable law where those apply.