# Flex Sudoku — Flex Sudoku

> Sudoku game with multiple grid sizes, built-in solver, and game tracking. (iPhone/iPad app by Jatinder Gogna.)

- Source: https://appshunter.io/ios/app/flex-sudoku/id1643590351 (this page in markdown: same URL + `.md`)
- Developer: [Jatinder Gogna](https://appshunter.io/developer/1631001233)
- Category: Games, Entertainment, Puzzle, Strategy
- Price: Free
- Rating: 3.43/5 from 7 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.4 · 4 MB
- Languages: English
- Released: 2022-09-09
- Data updated: 2026-07-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/flex-sudoku/id1643590351/reviews.md

## What is Flex Sudoku?

Challenge yourself by playing more complex version of sudoku. You can try the classic 9x9,  or more complex 16x16 or 25x25. You can even try 4x4 version for fun. 

Here is what you can do with the game:
1. Play classic, 16x16, 25x25 or 4x4 size sudoku game.
2. Play by loading thousands of built in games or enter your own game.
3. Choose the degree of difficulty of these games. 
4. A sudoku solver is built in and can be used for solving any game you are playing.
5. Enter Notes while solving the game or using mutliple levels of hints to help you with the game. 
6. Keep track of number of games played, minimum, maximum and average time to complete the game.

## Key features

- Multiple Sudoku grid sizes (4x4 to 25x25)
- Load thousands of built-in games
- Enter and solve your own games
- Adjustable difficulty levels
- Built-in Sudoku solver
- Note-taking and hint system
- Track game statistics

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/flex-sudoku/id1643590351/reviews.md

### 2/5 — No save progress

*2024-09-29*

Fun game. However, 3 times now my game has been reset mid game, hours into progress game stops working. Do not shut off app while in mid game, it will not save state. Frustrating to lose game over and over after hours of play because developers are lazy. Do better jeets

### 4/5 — Removing incorrect entry

*2024-09-20*

The directions you give for deleting an incorrect number doesn’t always work. This is extremely frustrating. Is there a way to fix this?

### 3/5 — Missing useful functionalities

*2024-08-30, version 1.5*

From a near zero failure rate on difficult level 9x9 grids (played on other apps) I now have nearly 50% failure rate on your 16x16 medium level, to the point where I’m now doubting the app itself!
The following features would be really helpful add-ons: 
1. a « Backstep » button; 
2. an error flag (on/off setting); 
3. a « Show all errors » button; 
4. a « replay grid » button.
The Notes button should be bigger; half the time I have to repeat entries because the button hasn’t triggered on/off, even on the larger view iPad. Ideally two separate keyboards should be available, one for notes, the other for actual entries, if the screen real estate can accommodate this.
Otherwise I’m happy with the 1-16 numbering, but offering 1-9 + A-G as an option would make the app more appealing to some players.

### 2/5 — Some good some bad

*2024-02-16*

Like the layout but no way to change notes when you know it can not be those numbers. Should be able to edit notes easily. Could not navigate the use of the control buttons when they are used for different things by how many times you punch or hold. Too confusing.

**Developer response:** You can enter or delete notes using the following steps:
1. Pressing Notes button enables/disables Notes editing mode.
2. While in the Notes editing mode, select a number that you want to enter or delete in notes.
3. After that, pressing a square will 
	a. Enter the number as a note if it is not already there or
	b. Remove the number from notes if it is already there.
4. You can also long press Notes to remove all notes.

### 5/5 — Thank you

*2024-02-01, version 1.5*

Thank you for creating those grids. They are my favourite and they are so rare!! I can’t imagine how hard they are to create. The highlight also really helps compared to a paper grid. My only request would an option to have # 1 to 9 + letters A to G for 16x16 grids, instead of #1-16, but that’s only because that’s what I’m used to. Thanks again!!

### 5/5 — Great game but one problem

*2023-08-13*

Game does not continue if you can’t finish in one sitting. Occasionally you can return to play more but usually if you leave, you have to start all over again. Would be nice to have a way to save your game so that you can finish it.

**Developer response:** Thank you for your feedback. Please download the latest version (version 1.4 and onwards) that fixes this issue and will allow to continue playing the game from a previous session ( even if the previous session crashed or was terminated abnormally).

## Frequently asked questions about Flex Sudoku

### What Sudoku grid sizes does Flex Sudoku offer?

Flex Sudoku allows you to play classic 9x9 grids, as well as more complex 16x16 and 25x25 sizes. It also includes a 4x4 version for quick fun.

### Can I play Flex Sudoku offline?

The description does not specify offline play capabilities. However, as a puzzle game, it is likely playable without an internet connection once installed.

### Does Flex Sudoku have ads?

No, Flex Sudoku does not contain advertisements, as indicated by the 'hasAds' flag being false.

### How difficult are the games in Flex Sudoku?

You can choose the degree of difficulty for the games you play. The app also features a built-in solver to assist you.

### What devices is Flex Sudoku available on?

Flex Sudoku is available for iPhone, iPad, and iPod devices.

### How often is Flex Sudoku updated?

The latest version, 1.5, was released on December 24, 2023. This indicates a relatively recent update frequency, with updates occurring approximately annually.

### What is the age rating for Flex Sudoku?

Flex Sudoku has an age rating of 4+, making it suitable for a wide range of players.

### Can I create my own Sudoku puzzles in Flex Sudoku?

Yes, you can enter your own Sudoku games to play and solve within the application, in addition to loading built-in puzzles.

## Version history (last 5 releases)

### 1.5 — 2023-12-24

Fixes a bug where, under certain cases, an incorrect cell responds while playing a resumed game. This is now resolved.

### 1.4 — 2023-08-30

1. Allow to continue playing the game from the previous session.
2. Change to the advance hint calculations to show more accurate hints.

### 1.3 — 2022-11-11

1. A new button 'Short Hint/Notes' lets you to display the context sensitive Hint or Notes for the number being played ( selected on the keypad). Pressing the button again toggles the display to show all applicable values for the Hint/Notes.
2. A new setting option to set the app appearance to Auto, Light or Dark mode.

### 1.2 — 2022-09-16

Minor bugfixes related to timer display in the statistics.

### 1.1 — 2022-09-11

Minor changes related to the Timer display and Notes entry.

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## More apps by Jatinder Gogna

- [Tic Tac Toe : Multi-level](https://appshunter.io/ios/app/tic-tac-toe-multi-level/id1631001231)

All apps by Jatinder Gogna: https://appshunter.io/developer/1631001233

## Related topics

[sudoku 16x16](https://appshunter.io/ios/topics/sudoku-16x16) · [sudoku 16x16 game](https://appshunter.io/ios/topics/sudoku-16x16-game)

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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 2026-07-05.*