# SudokuFang: Learn Sudoku — Step-by-step hints & solver

> Sudoku solver and educator that explains techniques and solves imported puzzles. (iPhone/iPad app by 洋 胡.)

- Source: https://appshunter.io/ios/app/sudokufang-learn-sudoku/id6759851865 (this page in markdown: same URL + `.md`)
- Developer: [洋 胡](https://appshunter.io/developer/1881219062)
- Category: Education, Entertainment
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 70 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-03-03
- Data updated: 2026-10-20
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sudokufang-learn-sudoku/id6759851865/reviews.md

## What is SudokuFang?

SudokuFang — the sudoku that explains every step.
Hints don't give away the answer: they name the technique, mark the relevant area, and reveal the reasoning step by step.
Import any standard sudoku by photo or by hand for an instant rating and a complete solve path.
No ads. No subscription.

[Layered Hints]
· Optional five-layer reveal: technique, area, candidates, eliminations, full explanation
· 70+ techniques, from basic eliminations and pairs to chains, fish and beyond

[Analysis Workshop]
· Import by camera, by hand, or by paste
· Detects no solution, a unique solution, or multiple solutions
· Difficulty rating (ER and score) with a technique breakdown
· Complete solve path, with the technique, eliminated candidates and placed digit marked at every step
· View alternative techniques at any step; long-press a candidate to test a hypothesis
· Generate puzzles within a score range
· Export the solve as a GIF or a long image

[Daily Challenge & Library]
· Daily Challenge: the same puzzle worldwide, medal calendar, same-month make-up days
· Library: seven difficulty tiers, plus your own grouped collections
· All-time and weekly leaderboards; race friends on the same puzzle in a room (online)

[Variants]
· 20 variants: Killer, Diagonal, Jigsaw, Windoku, Thermo, Kropki, Sandwich, Skyscrapers and more, each with four difficulty levels
· Custom rule combinations on boards from 4×4 to 9×9

[Input & Display]
· Auto-candidates, 10-color annotations, chain drawing, solve replay
· Customizable keypad layout, key placement and gestures
· Apple Pencil handwriting on iPad
· Over twenty color schemes, plus themes generated from your photos

## Key features

- Step-by-step solution explanations
- Photo import for puzzles
- Difficulty rating and technique breakdown
- Extensive library of Sudoku techniques
- Daily challenges and leaderboards
- Over 20 Sudoku variants
- Practice puzzle generation

## Is SudokuFang safe?

Not enough ratings yet to assess SudokuFang.

## Is SudokuFang legit?

SudokuFang: Learn Sudoku has limited verification signals. The AppsHunter Legitimacy Score for SudokuFang is 58 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sudokufang-learn-sudoku/id6759851865/reviews.md

### 5/5 — awesome！

*2026-08-24*

Really comfortable to use. The interface is clean, the controls feel smooth, and the overall solving experience is great.

The analysis feature is seriously powerful. I've tried quite a few Sudoku apps, and I haven't seen anything stronger yet.

## Frequently asked questions about SudokuFang

### Does Sudoku-Daily Sudoku Challenge have ads?

No, Sudoku-Daily Sudoku Challenge is ad-free. The app description explicitly states 'No ads. Open the app, and it's just sudoku.'

### What devices does Sudoku-Daily Sudoku Challenge support?

Sudoku-Daily Sudoku Challenge is available on iPhone and iPad devices.

### How does Sudoku-Daily Sudoku Challenge help me learn new techniques?

Each hint reveals information layer by layer, names the technique, and links to full lessons. The app also generates practice puzzles targeting specific techniques.

### Can I import puzzles from real-life sources into Sudoku-Daily Sudoku Challenge?

Yes, you can import puzzles by camera, by hand, or by pasting text. The app will then check for solutions, rate difficulty, and provide an explained solve path.

### What kind of Sudoku variants are available in Sudoku-Daily Sudoku Challenge?

Sudoku-Daily Sudoku Challenge offers over 20 variants, including Killer, Diagonal, Jigsaw, Windoku, Thermo, Kropki, Sandwich, and Skyscrapers, each with multiple difficulty levels.

### Is there a way to compete with other players in Sudoku-Daily Sudoku Challenge?

Yes, the app features score leaderboards and head-to-head races on the same puzzle when playing online.

### What is the age rating for Sudoku-Daily Sudoku Challenge?

Sudoku-Daily Sudoku Challenge has an age rating of 4+.

### How often is Sudoku-Daily Sudoku Challenge updated?

The latest version is 1.0.15, and the app was last updated on August 21, 2026, indicating a relatively frequent update schedule.

## Version history (last 5 releases)

### 2.2.0 — 2026-10-20

New & Improved
• Multiplayer, rebuilt: Quick Match or a Private Room, with Race, Co-op and Teach modes
• Photo import, rebuilt: detects the puzzle type automatically and reads Killer, Jigsaw, Kropki Dots, XV and other variants, plus Mini Sudoku
• Solving tools: Drag to Select, Combos, Pen, Shade and Check, with hardware keyboard support
• Floating button and card: put a favorite tool, the Draft panel or hints anywhere on screen, and long-press to switch tools

Other
• Bug fixes

### 2.1.0 — 2026-10-11

New
• Custom rules: build your own line and outside-clue rules in the Workshop and combine them with built-in rule templates
• Random puzzles: pick a board size and difficulty to get 1–3 random variant rules, then lock the ones you like and reroll the rest
• Variant sudoku hints: step-by-step hints for cage arithmetic, variant chains and more, with a next step when you are stuck
• Layered hints: see the technique first, then where to look and the key candidates, or jump straight to the answer

Improved
• New solving engine: faster hints, ratings and puzzle generation, with explanations for more techniques

Other
• Bug fixes

### 2.0.2 — 2026-09-20

New
• Pencil handwriting: write digits straight into cells with Apple Pencil; small corner digits become candidates; learns your handwriting
• Custom rule sudoku: combine rules into a new puzzle, 4×4 to 9×9
• Input area settings: 5 keypad layouts, customizable key placement, Minimal and Full presets
• Lock input: lock a digit, Erase or Candidates for continuous entry
• Gesture settings: customizable long-press, double-tap, swipe and Apple Pencil actions
• Drag to fill: drag a digit key onto a cell to place it
• Display settings: candidate highlight modes, board and font size controls, coordinate labels; reorganized color schemes
• Help: help center, guided tour and in-context tips
• Redesigned home screen with a new Workshop entry

Other
• Bug fixes

### 2.0.1 — 2026-09-08

bug fix

### 1.0.15 — 2026-08-21

[Big] Variant Sudoku: from 3 to 20 variants
• New: Windoku, Center Dot, Anti-Knight, Anti-King, Even-Odd, Consecutive, XV, Kropki, Thermo, German Whispers, Renban, Palindrome, Between Lines, Sandwich, X-Sums, Skyscrapers and Little Killer
• Four difficulty levels for every variant, with a fully retuned difficulty curve — Medium bites, Hard means it
• Killer Sudoku board redrawn: cage sums moved onto the cage corner so candidates are never covered

[New] Variants now play like the classic game
• Notes, auto-candidates, pause, error checking, stats and results — all there
• 10-color annotations, chain drawing, elimination marks and board snapshots now work in variants too
• Stuck? Reveal the selected cell's answer

[New] Tap a number, light up the board
• With no cell selected, tap a keypad number to highlight every placement and every candidate of that number at once

[New] Turn a photo into a theme
• Generate a custom theme from any photo, with 30 fine-tune options
• New in-game palette: brightness, font size and highlight styles, one tap away

[Improved]
• New "chip" style for candidate highlighting
• Weekly leaderboard scoring fix
• Many interface refinements and stability fixes

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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 2026-10-20.*