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Fill the 9×9 grid so each row, column and 3×3 box contains digits 1–9 once. Select an empty cell and tap a number. Given digits cannot be edited. Relaxed play has no hearts, mistake-limit game-over or penalty for ordinary experimentation.

Choose Easy, Medium, Hard or Expert in the numbered level maps. There are 25 fixed offline puzzles per difficulty, 100 altogether. Every level is included without payment or resources.

Resume the active puzzle to keep entries, notes and edit history. Selecting a different puzzle can replace the active session; read the confirmation before continuing. Completion history remains separate. Do not assume every unfinished puzzle has its own saved session.

Notes are manual reminders: choose which digits to add or remove. Candidates separately previews legal numbers for the selected empty cell based on the current board. It does not populate your notes, and a legal candidate is not a guarantee of the correct solution.

Yes. Number entry, Notes, Candidates, erase, undo and redo are free. Erase removes your entry in an editable cell. Undo steps back through edits; redo restores undone edits while available. Given digits remain protected.

No. Conflicts identify repeated digits. A conflict-free entry can still differ from the solution. Optional mistake checking compares entries with the solution and records assistance.

Hints are unlimited and free. Tap Hint to display an explanation and review the highlighted cells. Apply the deduction if you want to, or continue solving yourself. There is no refill clock or resource purchase.

The solver explains supported deductions. If it cannot explain the next step, a reveal is clearly labelled solution assistance. Unlimited access does not mean every advanced solving strategy is supported.

Hints never automatically fill manual notes. Hint and assistance use is recorded locally, but reopening the same displayed hint does not count another use.

Use the dated calendar for today or playable past dates; future dates are disabled. Completing a date adds a marker and one daily star. Consecutive completed dates build streaks, and completing a month earns its award. Replaying does not duplicate stars.

No. Dates use a stable, versioned mapping into the existing catalogue. Puzzles can repeat across dates.

Daily dates use the device’s local clock. Check the date, time and time zone. Dates are not server-verified or tamper-proof. Playing past dates can affect recorded streaks; report unexpected results before deleting data.

No. The first release contains neither. Every puzzle, all editing actions and unlimited hints are included, with no subscriptions.

Normal gameplay works offline. Android’s only app permission is vibration for optional haptics. Choosing a website or email action opens your separate browser or mail app after the grown-up check; those external services may use the internet.

Open Me → Settings for light/dark appearance, sound, music, haptics, Auto-Lock, reduced motion, timer visibility and larger text. The timer pauses during relevant menus and backgrounding.

Yes. Replay it from Help; the real active game and its records are preserved while you practise.

The app shows a parent/guardian prompt and a locally generated arithmetic check. After a correct answer, explicit Continue opens the destination. A wrong answer or cancellation opens nothing. This is a basic exit safeguard, not identity verification; no age, date of birth or answer is stored. You can read the native privacy explanation and open-source notices inside the app without leaving it.

There is no account, developer-operated cloud synchronization or recovery service. Operating-system backups are separate and do not create a guaranteed restore service. Removing data or changing devices can lose progress.

Reopen the app, check available storage, restart the device if needed and check for an update through the channel where you obtained it. Keep the current installation and report persistent problems. Do not clear storage or reinstall as a first step: removed progress may be unrecoverable.

Use Me → Privacy Rights → Delete local progress. It removes active, temporary and preserved recovery saves belonging to the profile and starts a fresh profile. Read the deletion guide first; backups and support emails are managed separately.