LPP Studio disclaims all liability for any claims of trademark dilution or unfair competition, as we operate purely as an independent software creator. Users are also reminded that any in-game leaderboards, if present, contain no reference to third‑party brands. This privacy policy serves as a legal safe harbor: we are not "Sudoku™" or affiliated with any entity that claims proprietary rights over the puzzle format.
LPP Development Studio ("LPP", "we", "our", or "us") provides the Sudoku Game (mobile, web, or desktop application) – a logic puzzle tool designed for entertainment, cognitive training, and relaxation. This Privacy Policy explains how we handle any personal information when you download, install, or interact with our game. Because the core experience is offline‑first and puzzle generation occurs locally (or via minimal cloud features), data collection is extremely limited and never includes selling your data.
By using Sudoku Game, you acknowledge that this policy is binding and that we operate entirely independently from any newspaper, puzzle syndicate, or commercial sudoku brand. Our mission is to provide an ad‑free, tracking‑optional environment for puzzle lovers.
Our game collects only strictly necessary data to improve functionality and save your preferences. We never collect any information about the numbers you place in the puzzle, because solving progress is stored only on your device.
LPP uses the limited data we collect for the following legitimate purposes:
Under no circumstances do we use your data for targeted advertising, as our game contains no third‑party ads or promotional networks.
All sudoku grids presented in the app are generated algorithmically by LPP’s proprietary engine, written from scratch. The engine follows classic sudoku rules (9x9, digits 1-9, rows/columns/boxes unique). It uses a randomized backtracking solver combined with symmetric clue placement to guarantee a single solution. No puzzle is sourced from external databases, books, or commercial puzzle packs. Therefore, any similarity to puzzles distributed by third parties is purely fortuitous and not intentional.
To further avoid legal ambiguity, we do not use trademarked puzzle names like "Samurai Sudoku" or "Killer Sudoku" without clarifying generic use; all variant modes are clearly described as original interpretations.
All data stored on our servers (if you use cloud saves) is encrypted at rest (AES-256) and in transit (TLS 1.3). Local app data remains under your device’s sandbox security. We retain anonymous gameplay aggregates indefinitely for improvement, but personal data (nickname, email from support) is deleted within 24 months of inactivity or upon your request. Crash logs are anonymized after 90 days.
Puzzle generation logs: We do not store any history of puzzles generated for you. Each session is ephemeral.
Depending on your jurisdiction, you may have rights regarding your personal data processed by LPP:
To exercise any right, email [email protected]. We respond within 30 days. California residents: we do not sell personal information as defined by CCPA, and we do not discriminate for exercising rights.
Sudoku Game is suitable for all ages, but we do not knowingly collect personal information from children under 13 (or under 16 in certain regions). If we discover that a child has provided any personal data (e.g., via support form), we delete it immediately. Parents or guardians may contact us to request removal of any inadvertently collected information. The game does not feature chat, social logins, or behaviorally targeted ads.
LPP is based in the European Union (France). If you access Sudoku Game from outside the EU, your data may be transferred to and processed in the EU or in secure cloud regions (US/EU). For transfers from the EEA to the US, we rely on Standard Contractual Clauses (SCCs) and the EU-US Data Privacy Framework where applicable. By using the game, you consent to such transfers where necessary for providing the cloud sync feature.
Our lawful bases for processing personal data are: (a) Performance of a contract (providing the game functionality you requested); (b) Legitimate interests (improving the app, crash analytics, and puzzle generation quality); (c) Consent (for optional telemetry). You may withdraw consent at any time via in-app settings.
We may update this policy periodically. If changes affect your rights, we will notify you via in-app notice or email (if provided). The most current version always appears at this location. We also reaffirm that any future modification will never introduce hidden data collection or commercial affiliation with sudoku trademark holders. This document is legally binding and reflects LPP’s commitment to an original, non‑infringing puzzle experience.
For privacy inquiries, data requests, or questions about puzzle originality, please reach out:
We aim to respond to all privacy-related requests within 5 business days. For any concerns regarding resemblance to existing puzzles, please include the specific grid (screenshot) and we will regenerate or delete that pattern immediately.
Thank you for playing an independent, ethically coded sudoku experience. No external commercial strings attached.