Ninefold - Sudoku Logic Puzzle
Offline Brain Training, No Ads
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Five minutes a day for a sharper brain. A 300-level campaign plus an endless Hell Mode, every level graded by the logic it takes to solve.
Ninefold Sudoku is a brain-training sudoku built around one idea: every puzzle should teach you something. Instead of throwing random boards at you, it grades each level by the actual logic technique needed to solve it — so difficulty climbs smoothly and you genuinely get sharper.
Whether you are a complete beginner learning the rules or a seasoned solver hunting X-Wings and chains, Ninefold meets you where you are and takes you further.
THE CAMPAIGN — 300 LEVELS THAT TEACH
Work through 20 packs across five difficulty tiers — Beginner, Skilled, Hard, Expert and Master. Start with "only one number fits" and climb all the way to naked pairs, hidden triples, X-Wings, Swordfish, coloring and XY-chains. Each pack teaches one new technique and ends with a boss board. No sudden walls, no impossible jumps — a clean climb from rookie to master.
HELL MODE — HOW DEEP CAN YOU GO?
Available with Ninefold Premium, Hell Mode is an endless run that gets harder with every stage. Mistakes are unlimited, so you can keep learning under pressure. End the run whenever you choose, and Ninefold saves your best depth. One board at a time, full focus, no ceiling.
BUILT TO SHARPEN YOUR MIND
- Your Brain Profile tracks Focus, Logic and Memory and updates with every solve
- Smart notes (pencil marks), gentle highlights and guided rows keep you thinking, not guessing
- Best times, solve counts and 30-day trends show progress you can actually see
FEELS GOOD TO PLAY
Every move has a satisfying candy-brick response — tuned animation, sound and haptics that make solving feel great. Play in warm light, calm dark, or high-contrast paper themes.
WHY YOU WILL LOVE IT
- A true number logic puzzle, not luck — every board is solvable by pure reasoning
- No account required and fully playable offline
- No ads interrupting your solve
- Free to start, with an optional Premium upgrade
NINEFOLD PREMIUM (OPTIONAL)
Ninefold is free to play. Ninefold Premium unlocks the full experience — every difficulty pack, endless Hell Mode, advanced statistics and extra board themes. Premium is available as a monthly or yearly auto-renewable subscription, or as a one-time Lifetime purchase. Prices are shown in the app and vary by region. Monthly and yearly subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period, and your Apple Account is charged for renewal within 24 hours before the period ends. You can manage or cancel those subscriptions anytime in your device Settings.
Privacy Policy: https://gentleflow.github.io/legal/ninefold/privacy/
Terms of Use (EULA): https://gentleflow.github.io/legal/ninefold/terms/
Train your brain, one cell at a time. Download Ninefold Sudoku today.
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The developer, 亮 鲁, 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
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Information
- Seller
- 亮 鲁
- Size
- 13.9 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 4 more
- English, Japanese, Korean, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Ninefold Premium Monthly $2.99
- Ninefold Premium Lifetime $29.99
- Ninefold Premium Yearly $14.99
- Copyright
- © Ninefold Team