# Ninefold - Sudoku Logic Puzzle — Daily Sudoku & Brain Training

> Daily Sudoku & Brain Training (iPhone/iPad app by 亮 鲁.)

- Source: https://appshunter.io/ios/app/ninefold-sudoku-logic-puzzle/id6792068500 (this page in markdown: same URL + `.md`)
- Developer: [亮 鲁](https://appshunter.io/developer/1707802381)
- Category: Entertainment, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 22 MB
- Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 10 more
- Released: 2026-08-02
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/ninefold-sudoku-logic-puzzle/id6792068500/reviews.md

## What is Ninefold?

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.

DAILY CHALLENGE — ONE SHARED PUZZLE EVERY DAY
Open the challenge calendar for a new puzzle shared by players around the world. Complete each date, build your daily streak and fill the month to earn its badge. Missed dates remain available in the archive, so you can revisit the board without rewriting your streak.

THE CAMPAIGN — 1080 LEVELS THAT TEACH
Work through 54 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. A technique lesson auto-appears only at its first formal introduction; later matching boards keep the Tips button without interrupting play. Each stage ends with a boss board. No sudden walls, no impossible jumps — a clean climb from rookie to master.

THE TECHNIQUE LIBRARY — 14 ILLUSTRATED LESSONS
Every core technique comes with a step-by-step illustrated card that shows you exactly why the deduction works. It appears the first time you meet the technique, and lives in Settings whenever you want another look.

HELL MODE — HOW DEEP CAN YOU GO?
Hell Mode starts at high difficulty and continues as an endless descent, and your progress there is never reset. The first stage is free for every player; Ninefold Premium takes you the rest of the way down. Retry a stage and keep pushing deeper, or end the run whenever you choose — 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, unlimited mistakes throughout the Campaign, 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.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Ninefold Premium Yearly | $14.99 | per year |
| Ninefold Premium Monthly | $2.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Ninefold Premium Lifetime | $29.99 | one-time |



## Version history (last 5 releases)

### 1.6 — 2026-09-07

Two new Premium board assists.

Note highlight — every pencil mark matching the number you are working on lifts off the board, so a candidate you are tracking is easy to find across all 81 cells.

Last cell hint — when a row, column or box is down to its final empty cell, the key for the one number that fits rises out of the pad. No hint spent.

Both ship off. Switch them on under Gameplay assists in Settings.

### 1.5 — 2026-09-04

Monthly badges are here. Complete every Daily Challenge in a month to turn its grey coin into a colorful keepsake, celebrate with a new unlock ceremony, and revisit earned badges from the calendar.

Also new:
• 1,080 handcrafted Campaign levels across 54 packs and five difficulty tiers.
• Fully localized illustrated technique guides.
• Streamlined settings, appearance controls, and game actions.
• Refined dark-mode colors and candidate notes.

### 1.4 — 2026-08-26

Ninefold now feels right at home on iPad, with layouts tuned for the larger screen. Technique guides are clearer, notes avoid impossible candidates, and solving feels smoother.

### 1.3 — 2026-08-20

DAILY CHALLENGE
A new puzzle now waits in your challenge calendar every day. It is the same board for players around the world, so every solve feels shared. Complete today to grow your daily streak, revisit earlier dates from the archive, and finish the month to earn its badge.

ALSO IN THIS UPDATE
We refined long-text layouts and right-to-left support, expanded Ninefold to 20 in-app languages, and polished localization throughout the Campaign, Hell Mode, statistics and Premium screens.

### 1.2 — 2026-08-16

DAILY CHALLENGE
A new puzzle now waits in your challenge calendar every day. It is the same board for players around the world, so every solve feels shared. Complete today to grow your daily streak, revisit earlier dates from the archive, and finish the month to earn its badge.

ALSO IN THIS UPDATE
We refined long-text layouts and right-to-left support, expanded Ninefold to 20 in-app languages, and polished localization throughout the Campaign, Hell Mode, statistics and Premium screens.

## More apps by 亮 鲁

- [透明衣橱-你的时尚风格](https://appshunter.io/ios/app/id1639875256)
- [Airclap: File Transfer to PC](https://appshunter.io/ios/app/airclap-file-transfer-to-pc/id6467128147)
- [mydots.ideas](https://appshunter.io/ios/app/mydotsideas/id6477912895)
- [GT Alarm - Weekday Alarm Clock](https://appshunter.io/ios/app/gt-alarm-weekday-alarm-clock/id6752632723)
- [Sweeple - Minesweeper Puzzles](https://appshunter.io/ios/app/sweeple-minesweeper-puzzles/id6793437775)

All apps by 亮 鲁: https://appshunter.io/developer/1707802381

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*