# Cool Online Sudoku — Play 9x9 Sudoku

> A digital collection of 9x9 number puzzles with varying difficulty levels. (iPhone/iPad app by Denis Sokolov.)

- Source: https://appshunter.io/ios/app/cool-online-sudoku/id1423575036 (this page in markdown: same URL + `.md`)
- Developer: [Denis Sokolov](https://appshunter.io/developer/1161350207)
- Category: Games, Education, Board, Puzzle
- Price: Free
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 19 MB
- Languages: American English
- Released: 2018-08-17
- Data updated: 2026-07-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cool-online-sudoku/id1423575036/reviews.md

## What is Cool Online Sudoku?

Welcome to Online Sudoku Games. We offer you to dive into the magic of numbers and enjoy the largest collection of Sudoku.

First of all, let's figure out what Sudoku means. Sudoku is a numerical puzzle with a square field of 9x9 cells inside, that is, 81 cells in total. Sudoku is also called a magic square. The square is divided into 9 small squares, 3x3 cells.

At the beginning of the game, some cells has hints inside, the numbers from 1 to 9. The player's task is to fill the remaining empty cells with numbers from 1 to 9 so that the following three conditions are met:

* Numbers should not be repeated in one column;
* Numbers should not be repeated in one line;
* Numbers should not be repeated in a small square (3x3).

The difficulty of Sudoku depends on the initial number of hints. The more hints, the easier Sudoku is. Easy Sudoku can be solved in a few minutes. To solve a hard Sudoku, it may take more than an hour.

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## Key features

- Extensive Sudoku puzzle collection
- Adjustable difficulty levels
- Learn Sudoku rules
- Play on 9x9 grids
- Number placement logic


## Frequently asked questions about Cool Online Sudoku

### What is Cool Online Sudoku?

Cool Online Sudoku is a game that offers a large collection of 9x9 number puzzles. Players fill a grid with numbers 1-9, ensuring no repeats in rows, columns, or 3x3 subgrids.

### How difficult are the Sudoku puzzles in Cool Online Sudoku?

The difficulty of Sudoku puzzles depends on the initial number of hints provided. More hints make the puzzle easier, while fewer hints increase the challenge, potentially taking over an hour to solve.

### Can I play Cool Online Sudoku offline?

The provided data does not specify if Cool Online Sudoku supports offline play. It is described as an 'Online Sudoku Games' platform, suggesting an internet connection may be required.

### What devices can I play Cool Online Sudoku on?

Cool Online Sudoku is available for iPhone, iPad, and iPod devices, as indicated by its supported devices list.

### What is the age rating for Cool Online Sudoku?

Cool Online Sudoku has an age rating of 4+, making it suitable for younger players and children.

### How often is Cool Online Sudoku updated?

The last update for Cool Online Sudoku was on December 29, 2018, with version 1.0.3. This indicates infrequent updates in recent years.

### Does Cool Online Sudoku have ads?

No, Cool Online Sudoku does not contain advertisements. The app is free to play and does not feature any in-app purchases.

### What is the user rating for Cool Online Sudoku?

Cool Online Sudoku has a rating of 4.0 stars based on a single review. This limited feedback suggests potential for more user sentiment data.

## Version history (last 4 releases)

### 1.0.3 — 2018-12-29

* Added All Daily Levels for 2018

### 1.0.2 — 2018-10-31

Updated Daily Levels

### 1.0.1 — 2018-09-13

* minor bug fixes

### 1.0.0 — 2018-08-15

No release notes.

## Apps similar to Cool Online Sudoku

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Squid Sudoku](https://appshunter.io/ios/app/squid-sudoku/id1590299931) | 4.4 (13) | Free | Games |
| [Classic Sudoku Online](https://appshunter.io/ios/app/classic-sudoku-online/id1625718881) | 5.0 (1) | Free | Games |
| [Sudoku - online game](https://appshunter.io/ios/app/sudoku-online-game/id6444047811) | 4.5 (11) | Free | Games |
| [Sudoku Compete](https://appshunter.io/ios/app/sudoku-compete/id6443859021) | 3.7 (3) | Free | Games |
| [Sudoku Multiplayer Puzzles](https://appshunter.io/ios/app/sudoku-multiplayer-puzzles/id1538613985) | 4.4 (15) | Free | Games |
| [SolveSUDO Sudoku Games](https://appshunter.io/ios/app/solvesudo-sudoku-games/id6451365017) | — | Free | Games |

## More apps by Denis Sokolov

- [JoJoo Puzzle](https://appshunter.io/ios/app/jojoo-puzzle/id575901482)
- [4 Walls](https://appshunter.io/ios/app/4-walls/id583850557)
- [Aliens Like Milk](https://appshunter.io/ios/app/aliens-like-milk/id675603658)
- [Aliens Like Milk Lite](https://appshunter.io/ios/app/aliens-like-milk-lite/id688153097)
- [Aliens Like Milk For Kids](https://appshunter.io/ios/app/aliens-like-milk-for-kids/id715507722)
- [Hungry Little Bear](https://appshunter.io/ios/app/hungry-little-bear/id814413325)

All apps by Denis Sokolov: https://appshunter.io/developer/1161350207

## Related topics

[cool online sudoku](https://appshunter.io/ios/topics/cool-online-sudoku) · [denis sokolov](https://appshunter.io/ios/topics/denis-sokolov)

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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 2026-07-06.*