Sudoku Atlas — Variable-Dimension Sudoku

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No ads. Ever.

There is no ad SDK in this app. No banners, no interstitials, no rewarded video.

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No tracking. Ever.

No analytics, no crash reporters, no account system. Everything you do stays on your device.

✅

One purchase. Forever.

Pay once, own it. No subscription, no expansions to buy, no features locked behind a future paywall.

Play the way you think

Every grid size

4×4, 6×6, 9×9, 16×16, 25×25. From two-minute warm-ups to multi-day challenges, every step of the spectrum is here.

Focus Mode

Pick a cell and every value but the one it holds blurs away — placed digits and pencil marks alike. Only your chosen number stays crisp, so you can scan the whole board and see at a glance where it can still go.

Stamp Mode

Lock a digit and stamp it across cells in one motion. Pencil marks for candidates, glyph stamps for confident answers. Switch between them freely.

Checkpoints

Save your board state at any point and rewind to it if you go down a dead end. Explore bold moves without fear of losing your progress.

Seed Sharing

Every puzzle has a seed code. Share it with a friend and they get the exact same grid in the exact same starting state. Race, compare, collaborate.

Light, dark, and high contrast

Follows your system appearance and language by default. Prefer something different? Light, dark, high-contrast, and language can all be set explicitly in Settings.

Try it free. No strings attached.

The free version isn’t a teaser. You get real puzzles and a daily puzzle that never expires.

Daily Puzzle — a new 9×9 every day, free forever, no account required. Difficulty cycles through easy, medium, hard, and maximum.
Demo bank — puzzles across every grid size and difficulty level, enough to try everything the app offers before you decide.
One-time unlock — adds unlimited generation, all grid sizes, and seed sharing.

The commitment

Sudoku Atlas will never run ads. It will never collect or transmit data about you. It will never introduce a subscription or lock previously free features behind a paywall.

These are not promises from a marketing team. They are structural decisions. There is no ad SDK in this app. No analytics framework. No account system. No server that knows you exist. Everything runs on your device and stays there.

That commitment is permanent.