Sudoku
Daily 9×9 logic puzzle
Sudoku
A classic 9×9 logic puzzle for every commute, lunch break, and late night.
Play Offline
Key Features
A calm Sudoku app for iPhone and iPad. Puzzles stay on your device, and there are no ads during play.
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No In-Game Ads
Pure focus without intrusive interstitial video ads. Stay with the board from the first digit to the last.
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Offline Play
Puzzles are stored on your device, so you can start a game without a connection.
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Hints & Undo
A hint fills the selected empty cell with the correct digit. Undo a move, mark notes, and keep going.
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Daily Challenges & Streaks
One new puzzle each day. The calendar shows finished days and your streak. An optional reminder in Settings stays off until you turn it on. The first week is beginner-friendly.
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Sudoku Academy
Basic lessons are free and walk through the rules on the board. Intermediate and advanced technique lessons are part of Sudoku Premium.
- No ads during play
- Offline
How to Play Sudoku
Sudoku is a classic 9×9 logic puzzle. Fill the board so each row, column, and 3×3 box contains the digits 1–9 once. Play has no ads during a game, and puzzles stay on your device so you can start without a connection.
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Rows, columns, and boxes
Place digits 1–9 so no digit repeats in any row, column, or 3×3 box. Given clues cannot be changed.
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Four levels, one daily puzzle
Choose Easy, Medium, Hard, or Expert. Daily Challenge gives you one new puzzle each day, with a calendar and streak. The first week is beginner-friendly. You can turn on a reminder in Settings.
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One logical path
Every standard puzzle has one solution. Use notes, matching-number highlights, optional error checks, undo, and a timer when you want them.
Sudoku Tips & Solving Techniques
Learning how to solve hard Sudoku starts with three reliable scans. Naked singles clear easy boards. Hidden singles and elimination carry you through Medium, Hard, and Expert.
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Naked Single
Look at an empty cell and cross off every digit already used in its row, column, and 3×3 box. If only one digit remains, that cell is a naked single — place it. Repeat after every placement, because one filled cell often creates the next.
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Hidden Single
Pick a digit that is still missing from a row, column, or box. If only one empty cell in that unit can legally hold it, the digit is a hidden single even when the cell still has other candidates. Place it, then update the rest of the board. This is the technique that unlocks most “stuck” easy and medium puzzles.
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Elimination Strategy
Pencil in every legal candidate, then remove digits that already appear in the same row, column, or box. On harder puzzles, watch for pairs: when two cells in a unit can only be the same two digits, those digits are eliminated from every other cell in that unit. Patient elimination is how to solve hard Sudoku without guessing.
Support & FAQ
Need help with Sudoku? These answers cover difficulty, hints, and how to report a bug.
How do I choose a difficulty?
Pick Easy, Medium, Hard, or Expert. Daily Challenge starts gentler for the first 7 days after install. A calendar shows finished days and your streak. An optional reminder stays off until you turn it on in Settings.
How do hints work?
A hint fills the selected empty cell with the correct digit. Free players get 3 hints per day (as shown in the app). Sudoku Premium unlocks unlimited hints, extra board themes, and intermediate and advanced Sudoku Academy lessons. Basic Academy lessons stay free.
How do I report a bug?
Email orangepie2019@gmail.com with your iOS version, device, and what happened. Screenshots help. We read support mail and will get back as soon as we can.