# Sudoku classic. — Classic sudoku game.

> Classic Sudoku puzzle game with multiple difficulties and advanced solving tools. (iPhone/iPad app by Alejandro Castagnolo Martinez.)

- Source: https://appshunter.io/ios/app/sudoku-classic/id1453146715 (this page in markdown: same URL + `.md`)
- Developer: [Alejandro Castagnolo Martinez](https://appshunter.io/developer/1448413093)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 4.70/5 from 342 App Store ratings · 9 written reviews indexed
- Age rating: +4
- Requires: iOS 12.0 · 16 MB
- Languages: European Spanish, American English
- Released: 2019-03-01
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sudoku-classic/id1453146715/reviews.md

## What is Sudoku classic.?

Classic sudoku game for your iPhone and iPad.

Features:

- Four difficulty levels (easy, normal, hard, very hard).
- Tutorial with several techniques (from beginner to advanced) for solving the game.
- Unlimited undo and redo.
- Game saving.
- Notes.
- Auto noting empty squares.
- Auto updating notes.
- Square coloring with two colors for advanced techniques.
- Error checking (manual and automatic).
- Share the game with a friend via whatsApp, email, etc...

## Key features

- Four difficulty levels
- Tutorial with solving techniques
- Unlimited undo and redo
- Game saving
- Notes and auto-noting
- Error checking
- Share games

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Ads removal | $1.99 | one-time |


## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/sudoku-classic/id1453146715/reviews.md

### 5/5 — Sudoku

*2025-07-11, version 1.0.3*

It’s very relaxing and fun, and it also features a variety of mechanics and techniques.

### 5/5 — Brain games

*2025-05-22, version 1.0.3*

Love numbers

### 5/5 — Challenging at all levels

*2023-11-14, version 1.0.3*

Does offer “best” scores but is challenging

### 4/5 — Great basic Sodoku

*2021-10-30, version 1.0.2*

Love that I can add notes easily and alter easy.  My only complaint is that I don’t know how to save progress on a game once started and not completed.  Im a super busy mom so I play in spurts but if I need to exit and can’t save my progress but once I won’t keep playing.  I have to be able to jump back and forth.

### 4/5 — Gamed

*2021-04-17, version 1.0.2*

Games are not hard enough very hard is too easy

### 5/5 — Brain Function

*2021-04-16, version 1.0.2*

Makes one work one’s brain cells function

### 4/5 — Make it better

*2021-01-31, version 1.0.2*

I like this Sudoku Version. I like touching one number and having all “like” numbers highlighted at once. I like that when you enter a wrong number it is NOT colored immediately to indicate it’s wrong. You must do that individually and only if you are looking for that information. 

What would, in my opinion make it better; 

When you eliminate a number, all other pencil marks of that same number vertically, horizontally and within that same block would automatically self delete. 

Also when deleting pencil marks, it would be helpful to not have to pick the delete button after each pick to delete another, but rather once a number is picked you continue picking numbers you wish to delete until you are done and only then would you hit the delete key. (This BTW would even be less necessary) if the above suggestion is adopted. 

One other suggestion might be to have the button that adds all the pencil marks at once to be a toggle switch which would when hit a second time turn off all the pencil marks. Hence the pencil marks are displayed or not displayed at the users discretion. 

Thank you for the opportunity to make “User Suggestions”. I gave this version a rating of 4 stars. And on a scale of 1 to 10, I would rate this Sudoku an 8 and with my suggestions, a 10 or 5 star! It would vastly speed up ones ability to solve a given puzzle.

### 3/5 — Good but ...

*2020-09-27*

1. crashes if no internet connection !? Is it feature ?
2. “forgets” current state it another app is open

### 5/5 — Bug

*2019-10-03, version 1.0.1*

Check button helps user to cheat on

## Frequently asked questions about Sudoku classic.

### What is Sudoku Classic?

Sudoku Classic is a digital version of the popular number puzzle game designed for iPhones and iPads. It offers a classic Sudoku experience with various features to aid players of all skill levels.

### What are the key features of Sudoku Classic?

The app includes four difficulty levels, a tutorial covering beginner to advanced techniques, unlimited undo/redo, game saving, note-taking options, auto-noting, square coloring, and error checking. You can also share games with friends.

### Is Sudoku Classic free to play?

The application is free to download and play. It includes in-app purchases and advertisements, which can be managed through the app's settings or purchase options.

### What devices is Sudoku Classic compatible with?

This classic Sudoku game is available for your iPhone and iPad, offering a seamless experience across Apple's mobile devices.

### How can Sudoku Classic help me improve at Sudoku?

The app provides a comprehensive tutorial with various techniques, ranging from beginner to advanced strategies. Features like unlimited undo/redo, error checking, and note-taking also allow you to experiment and learn without penalty.

## Version history (last 4 releases)

### 1.0.3 — 2023-11-09

This update is for compliance with EEA and UK data protection laws (GDPR)

### 1.0.2 — 2020-05-05

Libraries update.

### 1.0.1 — 2019-03-22

Bugs review

### 1.0 — 2019-02-27

No release notes.

## Apps similar to Sudoku classic.

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sudoku· Classic Puzzle Games](https://appshunter.io/ios/app/sudoku-classic-puzzle-games/id1409781798) | 4.7 (63,338) | Free | Games |
| [Killer Sudoku - Brain Games](https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340) | 4.7 (26,567) | Free | Games |
| [Sudoku Joy: Number Master Game](https://appshunter.io/ios/app/sudoku-joy-number-master-game/id1460985516) | 4.9 (728) | Free | Games |
| [Sudoku·](https://appshunter.io/ios/app/sudoku/id839681682) | 4.7 (17,292) | Free | Games |
| [Sudoku Quest - Puzzle Games](https://appshunter.io/ios/app/sudoku-quest-puzzle-games/id671755288) | 4.7 (1,852) | Free | Games |
| [▻Sudoku - Classic Brain Game](https://appshunter.io/ios/app/sudoku-classic-brain-game/id366247306) | 4.8 (658,636) | Free | Games |

## More apps by Alejandro Castagnolo Martinez

- [Brain game. Picture Match](https://appshunter.io/ios/app/brain-game-picture-match/id1448413094)
- [Wood - Block - Puzzle](https://appshunter.io/ios/app/wood-block-puzzle/id1457045356)
- [Color - Link](https://appshunter.io/ios/app/color-link/id1460365023)
- [One - Touch - Draw](https://appshunter.io/ios/app/one-touch-draw/id1474978637)
- [Solitaire Card Game.](https://appshunter.io/ios/app/solitaire-card-game/id1484247366)

All apps by Alejandro Castagnolo Martinez: https://appshunter.io/developer/1448413093

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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 2026-08-23.*