Lucid Sudoku is a visual sudoku tutor that animates the reasoning behind every move. This page is for help, bug reports, and feature requests.
When emailing about a bug, please include:
Yes, with a free trial that includes 3 techniques and 5 puzzles. Full access is a one-time $4.99 unlock. No subscription. No ads.
Yes. Everything runs on-device. No account, no login, no network required to play.
Anonymous crash reports and anonymous usage analytics (which techniques you complete, bucketed durations, OS-major bucket). Nothing is linked to your identity. No puzzle content is sent off-device. See the Privacy Policy for full detail.
Settings → Privacy inside the app. One toggle disables Analytics and Crashlytics together.
Open the app, go to Settings → Restore Purchase. Sign in to the same Apple ID you used for the original purchase.
By design. Lucid Sudoku is a tutor, not a solver. It shows you the reasoning that leads to the next move — naked singles, hidden singles, pointing pairs, X-Wings, and more — so you learn to see the puzzle yourself. If you want a one-tap solver, this is not the app for you, and we won’t be offended if you say so.
Eight, in roughly increasing difficulty: Naked Single, Hidden Single, Naked Pair, Hidden Pair, Pointing Pair, Box/Line Reduction, X-Wing, and a guided “candidate elimination” walkthrough.
Hand-picked by the developer. A new one each day. You can also enter any puzzle manually.
Yes, all three. Accessibility is a first-class concern, not an afterthought. If you find an accessibility bug, please report it — those go to the top of the queue.
The app runs on iPad today. A native Mac version is being considered. No timeline.
Yes. Swordfish, Y-Wing, and Coloring are on the roadmap.
None at launch. This section will be updated as issues are reported and fixed.
See the Privacy Policy.