Sudoku Unbound
Logic hints. No ads, ever.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Sudoku Unbound is classic Sudoku on a calm, legible grid, with hints that teach real logic and no ads, ever.
HINTS THAT REASON
Ask for a hint and it comes in three steps. First it shows you where to look and names the technique. Then it explains the idea in one sentence. Only if you ask does it place the digit. A hint is always a deduction, never a guess. If you have made a mistake, the hint points to it first so you can fix it.
DIFFICULTY YOU CAN TRUST
Each level is defined by the hardest technique the puzzle needs, not by how many digits are given.
• Easy: singles only
• Medium: pairs and box–line reduction
• Hard: triples and X-Wing
• Expert: Swordfish, XY-Wing and XYZ-Wing
• Extreme: coloring and chains
Nineteen techniques in all. Every puzzle has exactly one solution, checked by the solver before it ships.
PLENTY TO PLAY
1,500 puzzles across Classic 9×9 and Mini 6×6. Each new game reshuffles one of them (digits, rows, columns) so it plays fresh and keeps its level. Play as long as you like.
TOOLS THAT STAY OUT OF THE WAY
• Notes, plus one tap to fill in every candidate
• Notes clean themselves up when you place a digit (optional)
• Unlimited undo and redo
• No mistake limit; mistake marking is optional and off by default
• Optional timer
• Highlights for the row, column, box and matching digits
• Your game saves itself and picks up where you left off
EVERY DAY
The Daily Challenge: one Medium puzzle a day, free.
Mini 6×6: short games in Easy and Medium.
SAME PROGRESS ON A NEW DEVICE
No account to create. With iCloud sync on, your statistics, Daily history, settings and the game you are playing follow your Apple Account, so a new iPhone or iPad picks up where you left off. Pro comes back from the App Store.
GAME CENTER
Optional leaderboards and achievements through Game Center: times for each level, for the Daily Challenge and for puzzles solved, plus 18 calm achievements with no streaks. Only grids solved without any help count for times: no hints, reveals, note checks or live mistake marking.
COMFORTABLE TO PLAY
Light and dark appearance. Soft sounds and haptics, each one can be switched off. Supports Dynamic Type and Reduce Motion. Runs on iPhone and iPad. Playing needs no connection.
FREE AND PRO
Free, with no time limit: Classic 9×9 Easy and Medium, Mini 6×6 Easy and Medium, the Daily Challenge, hints, notes and statistics.
Pro is a single purchase that unlocks Hard, Expert and Extreme. Pay once, keep it for good, and restore it on any of your devices. Nobody sees ads, with or without Pro.
PRIVACY
No account, no tracking, no ads. Your progress (statistics, games in progress, Daily Challenge and settings) follows your Apple Account through your own iCloud when sync is on. Nothing reaches us. Game Center, if you use it, is handled by Apple.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Updated links to support and privacy policy.
The developer, Francesco Guiducci, 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
For more information, visit the developer’s accessibility website .
Information
- Seller
- Francesco Guiducci
- Size
- 5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Italian, Spanish
- Age Rating
13+
- 13+
- Frequent
Contests
- In-App Purchases
Yes
- Sudoku Unbound Pro $3.99
- Copyright
- © 2026 Francesco Guiducci
