Privacy Policy

Last Updated: May 2, 2026

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1. Introduction

Welcome to Multiplayer Sudoku (https://multiplayersudoku.in), operated and maintained by Aman Patel ("we", "us", or "our"). We believe online privacy should be straightforward, transparent, and user-centric. This Privacy Policy details our policies regarding the collection, use, and disclosure of personal data when you access or play Multiplayer Sudoku, as well as the choices and rights you have associated with that data under applicable global regulations including the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA/CPRA).

2. Information Collection and Local-First Architecture

We do NOT require user account creation, passwords, phone numbers, or credit card information.

Our platform operates on a local-first philosophy:

  • Public Display Name & Avatar: When you enter a match, you may choose an optional display nickname and custom avatar. This is stored directly inside your device's browser via LocalStorage and is transmitted ephemerally to our multiplayer game server solely for match coordination.
  • Gameplay Telemetry: Completion times, error counts, puzzle ratings, and MMR score changes are recorded during competitive ranked matches to maintain our global leaderboards.
  • Server Logs: Like standard web platforms, our web servers automatically log non-identifying technical metadata including your browser type, device operating system, referring URL, and general timestamp of access. These logs are retained briefly for uptime monitoring and DDoS prevention.

3. Cookies, LocalStorage, and Tracking Technologies

Cookies are small files placed on your device. We utilize cookies and browser storage mechanisms for specific, essential purposes:

  • Strictly Necessary Storage: We use HTML5 LocalStorage to preserve your audio volume, neon glass theme settings (dark mode vs. light mode), coin balances, unlocked avatars, and solo puzzle progress across browser sessions. This data never leaves your device unless you actively participate in a multiplayer match.
  • Consent Management: We store your cookie consent preferences so you are not prompted repeatedly on every page load.
  • Advertising & Analytics Cookies: Third-party partners (primarily Google AdSense) place cookies to measure ad performance, prevent click fraud, and serve advertisements.

4. Google AdSense & Third-Party Advertising Vendors

Multiplayer Sudoku is funded by advertising, allowing us to keep all puzzles, variant academies, and tournaments 100% free of charge. We partner with Google AdSense and its certified advertising network to deliver advertisements across the platform:

  • Third-Party Vendor Cookies: Third-party vendors, including Google, use cookies (including the DoubleClick DART cookie) to serve ads based on a user's prior visits to this website and other websites across the Internet.
  • Personalized Advertising: Google's use of advertising cookies enables it and its partners to serve personalized ads based on browsing history, demographic affinities, and online interactions.
  • Opting Out of Personalized Ads: You may opt out of personalized Google advertising at any time by visiting the official Google My Ad Center.
  • Universal Industry Opt-Outs: You can also opt out of participating third-party vendor tracking via the Digital Advertising Alliance (DAA) or the Network Advertising Initiative (NAI).

5. European Union & UK User Rights (GDPR / UK GDPR)

If you are a resident of the European Economic Area (EEA) or the United Kingdom, you possess specific data protection rights under the General Data Protection Regulation:

  • Legal Basis for Processing: We process minimal gameplay data on the basis of legitimate interests (running a fair competitive multiplayer game) and consent (for non-essential cookies and personalized ads).
  • Right of Access & Portability: You have the right to request copies of your gameplay data stored on our servers.
  • Right to Erasure ("Right to Be Forgotten"): You may request the permanent removal of your leaderboard records or player nickname by contacting our privacy officer.
  • Right to Withdraw Consent: You can revoke cookie consent at any time by clearing your browser cache and cookies or modifying your preferences in the on-site consent banner.

6. California Consumer Privacy Rights (CCPA / CPRA)

Under the California Consumer Privacy Act, as amended by the California Privacy Rights Act (CPRA), California residents are entitled to specific disclosures:

  • Categories of Personal Information: In the preceding 12 months, we have collected internet activity identifiers (such as IP addresses and device browser types) solely for network security and advertising operations. We do not collect names, social security numbers, physical addresses, or financial data.
  • No Sale of Personal Information: Multiplayer Sudoku does NOT sell, rent, or trade your personal information to third parties for monetary consideration.
  • Right to Non-Discrimination: We will never deny services, charge different prices, or provide a degraded gaming experience should you exercise any of your privacy rights.

7. Children's Online Privacy Protection (COPPA)

Multiplayer Sudoku is designed for general audiences interested in brain training and logic puzzles. We do not knowingly collect, solicit, or maintain personally identifiable information from children under the age of 13 (or under 16 in certain European jurisdictions). If you are a parent or guardian and believe your child has provided us with personal information, please contact us immediately, and we will promptly remove such records from our database.

8. Data Security & Retention

We implement robust physical, technical, and administrative security measures to protect against unauthorized access, alteration, or destruction of server data. Match data and leaderboard entries are retained to facilitate global rankings. You can reset your client-side data (coins, local stats, theme preferences) at any time by clearing your browser's site data for multiplayersudoku.in.

9. Updates to This Privacy Policy

We may update our Privacy Policy periodically to reflect enhancements in our architecture, emerging legal requirements, or vendor updates. The "Last Updated" date at the top of this document indicates the effective date of the latest revision. Continued use of Multiplayer Sudoku following the posting of modifications constitutes your acknowledgment and acceptance of the revised policy.

10. Contacting Our Data Privacy Officer

If you have any questions, concerns, or requests regarding this Privacy Policy or our data handling practices, please submit an inquiry through our Contact page.