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Last updated: March 2026

Privacy Policy

This policy explains what information we may collect when you use Sudoku Online (the website), why we use it, and your general choices. It is written in plain language but is not legal advice. Sudoku Online is operated by Sprout, a South African company—the same organisation you can reach using the contact details at the end of this policy.

Operator of this website

Sudoku Online is operated by Sprout, located at 13 Marabou Street, Mbombela, 1201, South Africa. Where this policy says "we" or "us", it means Sprout in its role operating this website and its services, unless the context refers to a third-party service (such as Firebase or a payment processor) acting under its own terms.

Information we may collect

  • Account data: if you sign in, our authentication provider (Google Firebase Authentication) processes identifiers such as email and a user ID you can use across sessions.
  • Gameplay data: scores, difficulty, time, hint usage, streaks, and related fields needed to show leaderboards and improve game features.
  • Technical data: browser type, device category, and similar logs our hosting or analytics tools may record for security and performance.
  • Payment data: when you buy downloadable puzzles, our payment processor (e.g. PayFast) handles card or banking details; we receive status and identifiers needed to fulfil the order, not full card numbers on our servers.

Cookies and storage

We use cookies or local storage for language preference, session continuity, and similar site functions. Third-party advertisers, when enabled, may set their own cookies subject to their policies.

Advertising

If Google AdSense or similar services are enabled, those partners may use cookies or identifiers to show and measure ads. You can manage ad personalisation through your Google settings and browser controls.

Analytics

If configured, aggregated analytics help us understand traffic and errors. We avoid collecting unnecessary personal fields beyond what the analytics product needs by default.

Retention

We keep account and leaderboard data while your account remains active and as needed for legal obligations. You may request deletion of personal data where applicable law requires us to honour such requests.

Children

The site is not directed at children under 13 (or the minimum age in your jurisdiction). Parents and guardians should supervise minors online.

Changes

We may update this policy when features or laws change. The updated date at the top will move when we publish revisions.

Contact

For privacy-related requests—including questions about this policy, access to personal data, correction, or deletion where the law applies—email hello@sprouttech.co.za. Include your account email if the request concerns leaderboard or sign-in data. You may also use the contact form and other options listed at sprouttech.co.za/contact.

Sudoku Online

Sudoku Online is a free, browser-based Sudoku experience built for anyone who wants to practise logic puzzles without installing an app. You get unlimited puzzles, six difficulty levels from Easy to Insane, optional notes and hints, and a global leaderboard so you can see how you compare to other players.

You can play as a guest—no account is required to start a game. If you sign in, you can save your scores to the leaderboard and keep track of your progress over time. We also offer premium downloadable puzzle packs (PDF) for offline play, sold through a secure checkout, for players who want printable collections.

The site is designed to be fast, accessible, and readable in light or dark mode. Whether you are learning Sudoku for the first time or chasing faster solve times, we aim to give you a clear, distraction-free place to play.

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