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Yes — all 5,000+ Classic and Killer Sudoku puzzles, all 7 difficulty tiers, Daily Challenge, and Battle Mode are completely free. Optional cosmetic purchases exist in the Android app but never affect gameplay.
Killer Sudoku adds "cage" constraints to standard Sudoku rules. Dotted groups of cells must sum to a target number (shown in the top-left of each cage), using unique digits within the cage. No digit may repeat inside a cage. All cells start empty — cage sums are your only clues.
Every puzzle is generated using Mulberry32 — a deterministic seeded PRNG. The same level number always produces the same puzzle for every player on every device, with a mathematically guaranteed unique solution.
Use the form above or email support.mindplaylabsindia@gmail.com. For Android bugs please include device model, Android version, and a description. Screenshots or screen recordings help greatly.
We collect only what's needed — game progress, score data, and auth credentials if you sign in. We do not sell your data. See our Privacy Policy for full details. For data deletion, email us with "Data Deletion Request" in the subject.
Our Grievance Officer handles formal complaints under the IT Act 2000. Contact: support.mindplaylabsindia@gmail.com. We acknowledge within 24 hours and resolve within 15 calendar days.