Nordoku – Learn Sudoku
Solve like a master
Free · Designed for iPad. Not verified for macOS.
Learn 11 solving techniques with lessons and practice. Step-by-step hints, a short 6 × 6 sudoku, a daily challenge and a suggested next exercise – no ads, no tracking.
Nordoku is a sudoku that teaches. It doesn’t just tell you the next digit – it shows why the move works and helps you find the next one yourself.
HINTS THAT TEACH
When you’re stuck, a hint unfolds in five steps: first a nudge, then a closer look, and finally the full move with its reasoning highlighted in the grid. Ask for only as much help as you need. A puzzle solved with hints is still a puzzle solved.
LEARN AND PRACTICE
• 11 solving techniques, from Naked Singles to X-Wing and Swordfish
• A lesson for every technique: theory, a worked example in the grid and three exercises
• A technique guide with search steps, proof, a counterexample, a checklist and three worked grid examples, the last with a hidden answer
• Mixed practice where you spot the technique yourself
• Killer Sudoku basics in their own lessons
PLAY YOUR WAY
• Classic sudoku with five difficulty levels
• X-Sudoku, Jigsaw and Killer
• Daily challenge and streak – with an optional reminder
• Calm Zen mode with no clock and no mistake limit
• Scan a printed sudoku with your camera or enter it by hand: Nordoku checks the puzzle and tells you its level
• Notes, undo and adjustable assists
SHORT AND PERSONAL
• A short 6 × 6 sudoku and its own daily puzzle for when you have a few minutes
• Continue short sudoku from the start screen, undo a move and choose error checking. Progress now shows short-puzzle wins and daily history. 6 × 6 data is saved on this device and in JSON backups, without iCloud sync.
• The start screen suggests a level and an exercise – and tells you why
• Explain it yourself: short questions check that you understand a deduction
• After a game, review the reasoning behind a hint or mistake with one worked example.
• Once you’ve mastered a technique, hints name it right away – and if you keep needing hints for one, the start screen suggests practice
• Scan with the camera or choose a photo or screenshot from your photo library
FOLLOW YOUR PROGRESS
The Progress screen shows the techniques you have mastered, best times and a two-week history, and suggests what to practice next. A home screen widget keeps the daily challenge and your streak in view. Game Center leaderboards and achievements are there if you want them.
BEAUTIFUL AND CALM
A Nordic look with five color themes – Nordic, Forest, Aurora, Sand and Lake – in light and dark. Larger text and VoiceOver support.
FREE TO START
Free to download, with the rules, the first two techniques, the idea behind every technique, Easy and Medium puzzles (also in Zen mode), the daily challenge and the short 6 × 6 sudoku. The full version unlocks every technique, the hard levels, the variants and your own puzzles with one purchase – no subscription, no ads.
PRIVATE
No ads, no analytics, no tracking. Works offline and without an account. Your progress can sync across your devices with iCloud.
In English, German, French, Spanish, Portuguese, Italian, Dutch, Swedish, Norwegian, Danish, Finnish and Japanese. For iPhone and iPad.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New: a short 6 × 6 sudoku with its own daily puzzle, for when you only have a few minutes. The start screen now suggests a level and an exercise and explains why. New “Explain it yourself” questions check that you understand each deduction. After a game, review the reasoning behind a hint or mistake with one worked example. Once you’ve mastered a technique, hints name it right away, and if you keep needing hints for one, you’ll be offered practice. Open a lesson from a hint and return to your game. The scanner can now use a photo or screenshot from your photo library. Easy and Medium puzzles are better balanced, and the iPad lesson layout is improved.
Continue short sudoku from the start screen, undo a move and choose error checking. Progress now shows short-puzzle wins and daily history. 6 × 6 data is saved on this device and in JSON backups, without iCloud sync.
A technique guide with search steps, proof, a counterexample, a checklist and three worked grid examples, the last with a hidden answer
Improved digit recognition in photos of printed puzzles, including curved book pages.
The developer, Tuomo Ojala, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Tuomo Ojala
- Size
- 4.3 MB
- Category
- Board
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 11 more
- English, Danish, Dutch, Finnish, French, German, Italian, Japanese, Norwegian Bokmål, Portuguese, Spanish, Swedish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Functional body
