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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. Each puzzle starts with three hearts. An incorrect entry uses one; retrying the puzzle is free.

Home has separate Play Now and Resume actions: Play Now opens ordinary levels; Resume restores the actual unfinished ordinary or Daily puzzle. There are 1025 fixed offline puzzles: 50 Easy, 175 Medium, 225 Hard, 150 Expert, 275 Master, 150 Extreme. Easy and Medium are open. Hard unlocks after 2 Medium completions; Expert unlocks after 4 Hard completions; Master unlocks after 10 Expert completions; Extreme unlocks after 14 Master completions. A visible locked level can be opened early with 25,000 earned coins or two completed rewarded ads. Each earned ad saves one credit for that particular level; neither one ad nor dismissal alone unlocks it. Only the selected level opens, not its neighbours/tier, and no completion reward is granted. Sequential play unlocks later levels for free. Ordinary levels open in groups of 25 as progress is completed.

Resume restores the actual unfinished ordinary/Daily puzzle with its entries, notes, history and timer. Back keeps progress. Play Now opens ordinary levels. Starting another puzzle requires replacement confirmation. To discard just the active game, use Stop & Quit next to Restart, or Pause → Stop & Quit game. Stop & Quit requires confirmation and discards only the active puzzle’s entries, notes, history and timer. Earned coins, completed levels, Daily progress, unlocks and awards stay saved; used hints are not refunded. Play Now opens the ordinary level map. Ordinary completion prepares the next level in the same difficulty. Only one unfinished session is saved.

Notes are manual reminders: choose which digits to add or remove. Candidates toggles a preview of legal numbers in all empty cells based on the current board. Tap it again to hide the preview. 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. A digit different from the validated solution is flagged immediately and consumes one heart, even without a repeated visible digit. Notes, erase, undo and redo do not consume hearts; undo does not restore spent hearts.

There is no complimentary hint allowance. One saved hint can be earned from an optional rewarded ad; when none is saved, a new hint costs 1,000 earned coins. Saved hints are spent before coins, survive relaunches and can exceed three; they are not a recurring free allocation. There is no daily, three-day or accumulating free refill. Tap Hint, review the explanation and highlighted cells, then optionally Apply. Charges occur only after a new hint is successfully saved and displayed. Cancellation, errors and reopening that same hint do not charge again. Tutorial hints spend no real resources.

New profiles receive 3,000 coins once; existing balances were migrated once to a 10× denomination, not multiplied again on every update. Ordinary first clears pay Easy 500, Medium 600, Hard 750, Expert 1,000, Master 1,250, Extreme 1,500. Daily/challenge-trail first clears pay Easy 500, Pro 1,000, Pro Max 1,750, Time Trial 1,250. In versions with optional rewarded ads, one completed ad can grant 500 coins at most once per local date, then shows Claimed; another offers one saved extra hint. A reward is granted only when the advertising SDK reports it earned. Replays do not repeat coin rewards. Virtual coins cannot be bought for money, transferred or redeemed. There are no real-money prices.

Explained hints support singles, hidden singles, locked candidates, naked pairs and forcing contradictions. If it cannot explain the next step, a reveal is clearly labelled solution assistance. The hint system does not support every advanced solving strategy.

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

Every puzzle starts with three hearts. Any digit different from the validated solution immediately uses one, even without a visible duplicate. Notes, erase, undo and redo are free and do not consume hearts; undo does not restore hearts already spent. At zero, retry is free, or spend 4,000 earned coins for one heart, or choose an available rewarded ad for one heart. This continues the same puzzle with one heart, not a three-heart refill. An ad only grants its reward on the SDK earned-reward callback, not closing, cancellation or failure. No automatic ads, forced banners/interstitials or No Ads purchase is offered.

Choose today or a playable past date in Daily, press Play daily puzzle, then select Easy, Pro, Pro Max or Time Trial. The selected date stays with the session. Complete any puzzle for that date’s one star, calendar marker, streak and monthly-award progress; additional clears on the same date add no stars or separate star coins. In the 1.0.13 update, from 25 October 2026 through 7 January 2027, each dated puzzle pays its own first-clear reward once. Earlier builds have 160 dedicated puzzles through 3 December 2026. No extra ordinary reward is stacked onto a Daily clear. Outside that range, the original sequential trails retain shared stage rewards across dates. Legacy undated sessions do not invent a historical date. Future dates are disabled.

In the 1.0.13 update candidate, there are 300 dedicated Daily puzzles across 75 consecutive local dates for 25 October 2026 through 7 January 2027: one in each of four modes per date. This adds 140 Daily definitions to the earlier 160 through 3 December 2026. Definitions, IDs and date mappings are frozen/versioned; adding a pack does not change an existing saved puzzle. Other dates retain the original 25-stage sequential trails, which reuse ordinary catalog puzzles and may repeat across dates or modes. Saved games keep their original date, puzzle and content version. Time Trial allows 15 minutes of active play; menus, hints and backgrounding pause its countdown. Timeout grants no reward and retry is free.

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.

Supported versions offer optional rewarded ads for a saved hint, one heart, an early level unlock credit or the displayed daily coin gift. No ad starts automatically. There are no real-money purchases or subscriptions. Ordinary editing and retrying are free. Hints and early unlocks can also use earned virtual coins.

Normal gameplay works offline. In versions with optional rewarded ads, Android uses internet and network-state permissions for ad delivery, plus vibration for optional haptics. No advertising-ID permission is requested. Terms and Privacy Policy are bundled and stay inside the app. Separately labelled website links and Continue to email open your browser or mail app, with no arithmetic gate; those external services may use the internet.

Open Me → Settings for Light/Dark, Music, Tutorial music, Sound effects, Haptics, Auto-Lock, Reduced motion, Show timer and Larger text. Tutorial music is part of the 1.0.13 update. The timer pauses during relevant menus and backgrounding.

In the 1.0.13 update, open Me → Tutorial → Open Tutorial, or Help → Tutorial & practice. Choose Beginner, Intermediate, Advanced or Expert and open/reopen a lesson from its library. The course has 24 illustrated guides and interactive practice across 21 lesson models. Animated demonstrations, separate practice examples, knowledge checks, contextual prompts outside the clue area and larger boards help explain techniques. Correct/wrong-answer sounds and gentle tutorial music have separate settings. Learning progress, resume and replay are saved separately; practice preserves the real game, coins, hearts and hints. These offline app-rendered lessons are not narrated videos, streamed recordings or a subscription; the hint engine does not implement every advanced technique taught here.

Terms of Use, Privacy Policy and open-source notices open inside Sudokuzy without internet or an arithmetic question. Report a Bug and Contact us preserve your draft locally and open your email app only when you choose Continue to email. Review it and press Send yourself; screenshots can be attached there. If email launching fails, the app shows selectable subject/message details and copy actions. Separately labelled website links use your browser. In the 1.0.13 update, the first-run screen uses a calendar-based birth-date picker instead of text entry. The selected date calculates a local age band: 13 or younger, 14–17, or adult. Only an age band is saved locally; the birth date is not stored. Optional ads are unavailable to players aged 13 or younger.

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.