No ads. Ever.
There is no ad SDK in this app. No banners, no interstitials, no rewarded video.
Variable-Dimension Sudoku — 4×4 to 25×25
Sudoku at every scale.
Five grid sizes, from 4×4 to 25×25. Play with touch, mouse, or keyboard. The app works fully offline.
- No ads. Ever.
- No tracking. Ever.
- One purchase. Forever.
July campaign complete — €100 to UNICEF Venezuela relief
On 24 June 2026, earthquakes struck Venezuela. For July, the developer pledged all Sudoku Atlas profits to UNICEF. July store profit was small, so he topped up and donated €100 — the point was to help, not to wait on a large payout.
UNICEF España confirmed the donation on 6 August 2026 (order ID 1047738), for children and families affected by the Venezuela earthquake. Personal gift by the developer; not a UNICEF partnership or endorsement.
What you pay for
One purchase. Forever.
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.
Five grid sizes. One set of rules.
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.
Pricing by platform
Try it on mobile. The complete game is $4.99 on Steam.
The mobile download is free and includes Daily Puzzle plus a demo bank covering every grid size; a one-time in-app purchase unlocks the full version. On Steam, $4.99 buys the complete game, with no in-app purchases.
- Daily Puzzle on mobile — a new 9×9 every day, free forever, no account required. Difficulty cycles through easy, medium, hard, and maximum.
- Mobile demo bank — puzzles across every grid size and difficulty level, enough to try everything the app offers before you decide.
- One-time mobile unlock — adds unlimited generation, all grid sizes, and seed sharing.
- Steam — $4.99 for the complete game. No in-app purchases.
No network access
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.
iOS, Android, Windows, and Linux
Choose your platform.