# Sudoku² — Practice Sudoku Daily

> Infinite Sudoku puzzles with adjustable difficulty and helpful tools. (iPhone/iPad app by 春 李.)

- Source: https://appshunter.io/ios/app/sudoku/id959450517 (this page in markdown: same URL + `.md`)
- Developer: [春 李](https://appshunter.io/developer/525245233)
- Category: Education, Entertainment
- Price: Free with in-app purchases
- Rating: 3.90/5 from 10 App Store ratings · 26 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 6 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2015-04-16
- Data updated: 2026-08-27
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sudoku/id959450517/reviews.md

## What is Sudoku²?

Infinite free Sudoku puzzles with levels from Easy to Evil!
Key features:
-Solve just one puzzle to unlock next level
-Input pad with no distractions
-Redo/Undo
-Taking/Erasing notes with different colors
-Taking notes manually or automatically
-Error check can be enabled or disabled
-Multiple highlight mode

## Key features

- Infinite Sudoku puzzles
- Adjustable difficulty levels
- Distraction-free input pad
- Color-coded note-taking
- Manual/automatic note-taking
- Customizable error checking
- Multiple highlight modes

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Advertisement | $0.99 | one-time |


## Recent user reviews (10 of 26)

All indexed reviews: https://appshunter.io/ios/app/sudoku/id959450517/reviews.md

### 1/5 — Ads are bad

*2026-05-02*

Seeing ads that suggest my phone has been hacked due to visiting porn sites and wants me to install another app.

Obviously it is a scam.
Disappointed in game author.

### 1/5 — Need to fix the app. At some box you have to put correct number but system says its wrong.

*2025-03-30*

Need to fix the aap. At some box you can’t even put correct number. Even system says it’s wrong. I got screenshots if u want.

### 1/5 — My review

*2019-12-28*

It is really hard and started glitching.

### 5/5 — Please make it an independent Apple Watch App!

*2019-10-27*

Great app! I was wondering if you were going to make it an independent Apple Watch app?

### 5/5 — 好

*2019-04-08*

这个游戏很好

### 3/5 — 讨厌广告

*2019-03-06*

讨厌广告

### 5/5 — 好游戏

*2018-02-18*

开发大脑

### 5/5 — Numbers

*2017-07-24*

I like to solve puzzles with numbers in them so... yeah. This is my game.

### 5/5 — 挺好玩的

*2017-07-22*

有意思啊我玩了一通宵 底下了啊堤围意思？就这么多了啊呵呵呵呵😊呵呵哟额路上慢点开车去学校的事了啊呵呵蛇精神上慢点还有一个小时下班了啊

### 3/5 — Good try

*2017-07-14*

The game is not bad - not very challenging- however it's awkward to play - the selection box obscures too much of the game board and when a selection is made all of the hints remain so to see the board correctly one is constantly wasting time erasing hints. This becomes problematic because the selection box obscures so much of the game board.

## Frequently asked questions about Sudoku²

### How does Sudoku² help with learning?

Sudoku² provides a structured way to practice logic and critical thinking skills. By solving puzzles of increasing difficulty, users can improve their problem-solving abilities and concentration, which are beneficial for cognitive development.

### What learning methodology does Sudoku² use?

Sudoku² employs a progressive learning methodology. Users start with easier puzzles and advance to more challenging levels as they demonstrate mastery, ensuring a gradual and effective learning curve for developing logical reasoning.

### How does Sudoku² track user progress?

While Sudoku² focuses on providing an infinite stream of puzzles, progress is implicitly tracked by the user's ability to unlock increasingly difficult levels. Consistent play and successful completion of puzzles indicate skill improvement.

### Does Sudoku² offer certifications?

Sudoku² does not offer formal certifications. Its primary goal is to provide a platform for daily practice and mental stimulation through Sudoku puzzles, rather than academic or professional accreditation.

### What is the update frequency for Sudoku²?

Sudoku² was last updated on November 7, 2023, indicating a developer who provides periodic updates. The latest version is 2.33, suggesting ongoing maintenance and potential feature enhancements.

### Does Sudoku² have ads?

Yes, Sudoku² contains advertisements. As a free application with in-app purchases, ads are displayed to support its continued development and availability.

### What devices are supported by Sudoku²?

Sudoku² is available on a wide range of Apple devices, including the Apple Watch, iPhone, iPad, and iPod. This broad compatibility allows users to practice Sudoku across their preferred devices.

### What is the age rating for Sudoku²?

Sudoku² has an age rating of 4+, making it suitable for young children and adults alike. This rating indicates that the content is generally appropriate for all ages.

## Version history (last 5 releases)

### 2.33 — 2023-11-07

Update to iOS17
Fixed known issues.

### 2.31 — 2020-05-20

Fixed the issue with score submission.
Fixed UI issue on Apple Watch.

### 2.30 — 2020-05-07

1) Add a new option to input numbers below the board.
2) Adaption to iOS13.

### 2.22 — 2017-10-31

Optimize UI for iPhone X

### 2.21 — 2017-10-25

Optimize UI to iOS11

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## More apps by 春 李

- [Gomoku∙5 - line five in a row](https://appshunter.io/ios/app/gomoku5-line-five-in-a-row/id525245230)
- [成语爱接龙](https://appshunter.io/ios/app/id836443085)
- [Gomoku Solver](https://appshunter.io/ios/app/gomoku-solver/id853427553)
- [Sudoku² Golden](https://appshunter.io/ios/app/sudoku-golden/id979029059)
- [LS Player - mp3 repeater](https://appshunter.io/ios/app/ls-player-mp3-repeater/id1174201566)

All apps by 春 李: https://appshunter.io/developer/525245233

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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 2026-08-27.*