# Sudoku Extreme: Easy Hard Math — Classic Number Puzzle Killer

> Classic Sudoku puzzles with customizable themes, difficulty levels, and progress tracking. (iPhone/iPad app by Pranoy Chowdhury.)

- Source: https://appshunter.io/ios/app/sudoku-extreme-easy-hard-math/id1451683705 (this page in markdown: same URL + `.md`)
- Developer: [Pranoy Chowdhury](https://appshunter.io/developer/952263202)
- Category: Games, Entertainment, Board, Strategy
- Price: Free with in-app purchases
- Rating: 4.50/5 from 820 App Store ratings · 122 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 35 MB
- Languages: American English
- Released: 2019-02-14
- Data updated: 2026-09-01
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sudoku-extreme-easy-hard-math/id1451683705/reviews.md

## What is Sudoku Extreme?

Sudoku Extreme is a beautiful way to experience classic Sudoku puzzles for both beginners & advanced players! It's a great way to keep your mind active while relaxing to pass time. Each puzzle has only one solution. The puzzle comes with a few cells pre-filled. Your job is to fill the remaining empty cells. Fill the empty cells with numbers 1-9 in a way that each row, column and block (3x3 cells) only contains a single instance of the number 1-9.

- No ads. No subscriptions. All features are free.
- Over 100,000 puzzles in 6 different levels: beginner, easy, medium, hard, unfair and extreme.
- It is highly customizable with many beautiful themes as well as settings to customize the app exactly the way you like it. App comes with both light and dark amoled themes to be comfortable on your eyes!
- The simple to use notes and hint features help you if you get stuck but I encourage spending time trying to figure out the puzzles without using hints. Cells filled with use of hints don't get any points.
- Haptic feature gives a positive vibration when correct and negative vibration when wrong answer is filled. This can be disabled in settings.
- If you make a mistake you can use the undo, delete and redo buttons. Note that each mistake deducts points from your overall score.
- Long press the undo button to restart the game
- After a game is finished, you get your overall stats like total time spent, best time, average time, overall score, hints used, mistakes made etc. Sudoku Extreme also comes with a graph of how your scores progress over time. As you play more difficult levels, you get more score. Each higher level gives twice the number of points as the previous level.
- Game can be paused and you can resume the previous game when you come back.
- Sudoku Extreme can automatically pre-fill the notes and auto-remove them when they are used in a row, column or block. Though I encourage disabling this setting and filling it manually as it makes your brain more active! Manually filling notes also gets you extra points!
- The quick fill feature lets you tap-and-hold a number and then simply tap cells and it will fill it with that number.
- Numbers show how many instances of that number are left to be filled in the puzzle. When a number has been used 9 times correctly, it hides itself. You can disable this setting if you like.
- You can swipe up/down to enter notes numbers quickly without having to enter edit/note mode (setting needs to be switched on)
- There is a setting to allow up to 3 mistakes without being penalized in your score.
- "Export Scores" from the app. This can be used in Excel.

As a solo indie developer, there are ongoing costs of developing and maintaining the game. I don't use intrusive ads, trackers, subscriptions, or other nonsense that get in the way of playing. I provide all levels and customizations for free, hoping that players who enjoy the game will consider supporting it. So I'm asking, humbly: if my game brings you a moment of fun, please consider making a one-time purchase to help me keep it ad-free. No subscription. Just one small way to say thanks. It's a small and fair amount which helps cover development costs of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Thank you for supporting me. Hope you are enjoying the puzzles :)

Send me feedback at:
pran@pranapps.com

## Key features

- Multiple difficulty levels
- Customizable themes and settings
- Notes and hint features
- Haptic feedback
- Undo, delete, and redo functions
- Detailed game statistics and progress graphs
- Quick fill and auto-fill options

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Sudoku Extreme Premium | $9.99 | one-time |


## What do users think of Sudoku Extreme?

Overall sentiment: positive

**Pros**

- 🚀 Smooth gameplay
- 👍 Customizable themes
- 🔒 No data tracking
- 💡 Detailed statistics and graphs
- 👍 Intuitive user interface
- 🚀 Responsive and fast
- 👍 Comprehensive features

**Cons**

- 🐛 Difficulty levels not properly calibrated
- 🐛 Accidental number input issues
- 💰 Paywall for basic settings
- 🐛 Inconsistent difficulty across puzzles

**Commonly reported bugs**

- Scoring system inconsistencies at higher levels
- Animation issues causing delays in rapid input

**Most requested features**

- Option to disable auto-fill notes
- Ability to resume unfinished games
- Coloring and advanced note-taking tools
- Sync progress across devices
- Difficulty level selector before starting a game

## Recent user reviews (10 of 122)

All indexed reviews: https://appshunter.io/ios/app/sudoku-extreme-easy-hard-math/id1451683705/reviews.md

### 5/5 — Best sudoku app

*2026-07-29*

I’ve tried so many and this is by far my favorite sudoku app. I do wish there was a level between easy and medium. The easy ones are very simple and with the mediums I find myself sometimes stuck and can’t solve the puzzle so have to guess. I have looked up advanced strategies and have used many and gotten better, but still there are times when I see no way to move forward. Don’t know if that would be added on at some point, not just a hint at telling you a number but actually a strategy you can use to solve it at that point. This would take some doing I’m sure. Regardless I will still be playing my mediums and occasionally a hard puzzle. Great app!

**Developer response:** Thank you! The latest update now lets you try all Levels and change settings and themes for Free. However, I do hope some users try out the app and purchase the one-time-only purchase to support me.

I am a small indie developer. I do not use any ads whatsoever because I value user privacy. The only way for me to support ongoing development, maintenance of the app and developer fees is by having a single in app purchase. The in app purchase is also a small single one time only purchase and there are no subscriptions as I understand users dislike those. I think this model is quite fair as one gets to try the app and if they enjoy, they can buy the small 1 time only in app purchase to support development. I hope this explains my situation.

If you have questions, please email me at pran@pranapps.com

### 5/5 — Great App Hoping for More Future Updates & Features

*2026-07-24*

EDIT** Developer is continuing to update and has listened and added our requests :) Best sudoku app on the market. Well worth the premium purchase

Latest update was 3 years ago, and I purchased the premium version to support the developer. I really hope this app continues to receive updates, as it has a lot of potential. I do have a few suggestions:

* Add an option where using the “X” also removes notes from cells
* Include a toggle that allows up to 3 mistakes (can be edited) per game
* Expand customization options. More colors or even a color wheel would be great

Overall, I’d love to see this app continue to grow with more features and improvements.

**Developer response:** Hello, the latest update now includes a setting to allow up to 3 mistakes.

Would you mind emailing me what you mean by "using the “X” also removes notes from cells"? Do you want it to remove all notes from that cell?

pran@pranapps.com

### 5/5 — Addictive

*2026-07-09*

One of the better ones available. No troublesome Ads and engaging difficulty levels. Can be better by including a restart option for any puzzle midway.

**Developer response:** Thank you for the kind words. You can restart any puzzle midway by long pressing the undo button and it will ask you if you want to restart. - Pran (developer)

### 1/5 — Kind of disappointing

*2026-06-04, version 7.0*

I had hoped that this app would teach sudoku concepts, rather than just give a hint by telling you a number. 
I had a great sudoku app that is no longer made, and it let me scan games in as well as taught different techniques. So when you asked for a hint, it would say something like “look for a naked pair” rather than saying “do you accept defeat?“ I think that’s just insulting and stupid because it doesn’t teach anything. It just fills in the number for you.

### 5/5 — Great App Hoping for More Future Updates & Features

*2026-04-29, version 7.0*

Latest update was 3 years ago, and I purchased the premium version to support the developer. I really hope this app continues to receive updates, as it has a lot of potential. I do have a few suggestions:

* Add an option where using the “X” also removes notes from cells
* Include a toggle that allows up to 3 mistakes (can be edited) per game
* Expand customization options. More colors or even a color wheel would be great

Overall, I’d love to see this app continue to grow with more features and improvements.

### 5/5 — One of the better sudoku apps

*2025-12-14, version 7.0*

Nice themes, good gameplay. I’d really like to see GameCenter syncing of my scores between devices.

### 4/5 — GREAT App

*2025-11-10*

Points for stating how you score the puzzle, with a simple strategy to maximize points. BIG niggle: I would like to reset the statistics preferably each difficulty separately. I like to play 25 games at a go. Currently the only way I see is to delete and DL. Small niggle: currently if you abandon a game (can’t solve) the game isn’t noted in the games played statistic. There doesn’t have to be a penalty but a simple counter would be nice.
Finally, the game before paying the app came off sort of clunky to me, if you find this, ignore it and unlock the full game. Worth every penny

**Developer response:** Hello

The latest update now includes a feature where you can just swipe left on a level to reset its scores. So now, you don't need to delete and redownload the app. Hope you update your review after trying :)

Pran

### 1/5 — No access to hard sudokus

*2025-11-02*

App does all the work and you can’t turn off the cheats without paying. Uninstalling.

**Developer response:** The latest update now lets you try all Levels and change settings and themes for Free. Hope you give it a try and update your review :)

The app is developed by a small indie developer. I do not use any ads whatsoever because I value user privacy. The only way for me to support ongoing development, maintenance of the app and developer fees is by having a single in app purchase. The in app purchase is also a small single one time only purchase and there are no subscriptions as I understand users dislike those. I think this model is quite fair as one gets to try the app and if they enjoy, they can buy the small 1 time only in app purchase to support development. I hope this explains my situation and hope you update the 1 star review.

If you have questions, please email me at pran@pranapps.com

### 5/5 — Errors and I have pics

*2025-09-26*

I have two pictures if you’re interested contact me and I will send them to you. One picture shows blank squares where I tried to enter the correct number. The game would not accept it so I moved on and solved the rest of the puzzle and then I took pictures after I entered the missing numbers again and it accepted the correct numbers which I tried to enter the first time the reporting shows the number of mistakes I made, which

**Developer response:** Edit: I am not understanding your review as it mentions words which don’t apply to my app. For example “Siri” and “hot” don’t apply to my app at all. Did you mean to leave the review on another app?

Previous reply: You can use the “show timer” setting to hide it. If you have questions, email me at pran@pranapps.com

### 4/5 — Great Application

*2025-06-18, version 7.0*

Nicely done but a teaching help would be a great addition (when we get stuck).

## Frequently asked questions about Sudoku Extreme

### What is Sudoku Extreme: Classic Number?

Sudoku Extreme is a mobile application that offers classic Sudoku puzzles for players of all levels. It provides a relaxing way to keep your mind active, featuring a single solution for each puzzle. The app allows you to fill in missing numbers based on Sudoku rules.

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

Key features include six difficulty levels from beginner to extreme, customizable themes with light and dark modes, and helpful tools like notes and hints. It also offers haptic feedback, undo/redo options, detailed game statistics, and progress tracking.

### How much does Sudoku Extreme cost?

The app is free to download and play, with no ads or subscriptions. Advanced levels, themes, and settings customization are available through a small, one-time in-app purchase to support development.

### What devices is Sudoku Extreme compatible with?

While specific device compatibility is not detailed, the app is designed for mobile use. It offers both light and dark amoled themes for eye comfort, suggesting it is available on devices that support these display features.

### What are the common use cases for Sudoku Extreme?

This app is ideal for passing time, exercising your brain, and improving logical thinking skills. It's suitable for both beginners learning Sudoku and advanced players seeking a challenging experience, all within a customizable and ad-free environment.

## Version history (last 5 releases)

### 18 — 2026-08-28

- Fixed a bug where cell with a possible candidate was being highlighted even when notes were toggled off.
- Board now shows the level name at top.
- Long pressing the notes button now lets you fill remaining notes automatically. Swiping up and down on the notes button still lets you toggle their display hidden/unhidden.
- Fixed a bug where changing levels or some settings wasn't creating a new puzzle and offering to resume previous puzzle instead.
- As requested by a user, added two new settings which are OFF by default: "Different color for selected Row, Column, Block" and "Highlight entire cell of note containing selected number"
- Fixed the ordering of couple settings.
- Switched from brackets to triangles at corners of the selected cell.
As a solo indie developer, there are ongoing costs of developing and maintaining the game. I don't use intrusive ads, trackers, subscriptions, or other nonsense that get in the way of playing. I provide all levels and customizations for free, hoping that players who enjoy the game will consider supporting it. So I'm asking, humbly: if my game has brought you a moment of fun, please consider making a one-time purchase to help me keep it ad-free. No subscription. Just one small way to say thanks. It's a small and fair amount which helps cover development costs of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Thank you for supporting me. Hope you are enjoying the puzzles :)

Send me feedback at:
pran@pranapps.com

### 15 — 2026-08-27

- As requested by a user, added two new settings which are OFF by default: "Different color for selected Row, Column, Block" and "Highlight entire cell of note containing selected number"
As a solo indie developer, there are ongoing costs of developing and maintaining the game. I don't use intrusive ads, trackers, subscriptions, or other nonsense that get in the way of playing. I provide all levels and customizations for free, hoping that players who enjoy the game will consider supporting it. So I'm asking, humbly: if my game has brought you a moment of fun, please consider making a one-time purchase to help me keep it ad-free. No subscription. Just one small way to say thanks. It's a small and fair amount which helps cover development costs of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Thank you for supporting me. Hope you are enjoying the puzzles :)

Send me feedback at:
pran@pranapps.com

### 14 — 2026-08-21

- As requested by a few users, added a new setting "Show focus brackets around selected cell". This will show 4 focus brackets at the corners of the selected cell. This assists in easily finding which cell is currently selected and in focus. By default, this is on.
- Note that now you can try all difficulty levels and change settings & themes for free. I am a small indie developer and need your help keep the lights on. I offer a beautiful app free of ads, subscriptions, trackers and analytics for the absolute best experience for my users. I am even giving away all features for free to try. If you are enjoying the puzzles, please support me by purchasing the one-time-only in-app-purchase. It's a small and fair amount which helps me pay for development costs of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Thank you for supporting me. Hope you are enjoying the puzzles :)

Send me feedback at:
pran@pranapps.com

### 12 — 2026-07-22

- Fixed a bug where the "Start in note mode" setting was not obeyed when Restarting a game.
- Note that many users emailed me about correct single answer cells being suddenly highlighted as yellow. This was due to the adding of a new setting to highlight cells with only single numbers with different colour. While I have turned this setting off now by default, some users may need to manually turn this off if their app was updated in a prior update. Sorry about this inconvenience.
- Note that now you can try all difficulty levels and change settings & themes for free.

I am a small indie developer and need your help keep the lights on. I offer a beautiful app free of ads, subscriptions, trackers and analytics for the absolute best experience for my users. I am even giving away all features for free to try. If you are enjoying the puzzles, please support me by purchasing the one-time-only in-app-purchase. It's a small and fair amount which helps me pay for development costs of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Thank you for supporting me. Hope you are enjoying the puzzles :)

Send me feedback at:
pran@pranapps.com

### 11 — 2026-07-19

Thank you for supporting me. Hope you are enjoying the puzzles :) This update includes some highly requested features based upon your feedback:
- Now you can try all difficulty levels and change settings & themes for free. While all features are free, I hope you support my development costs with the one-time-only in-app-purchase.
- Added a new setting to highlight cells with only single numbers with different colour. Turned this setting off by default.
- Fixed a bug where the new showing mistakes setting wasn't working if allowing up to 3 mistakes setting was off.
- Fixed a bug where disabling show score setting wasn't working.
- Added a new setting to allow up to 3 mistakes without being penalized in your score. Showing mistakes can also be disabled with a new setting.
- Now you can swipe left on a difficulty level to reset scores.
- Fixed a bug where app would report incorrect when long pressing to enter number.
- Updated to latest iOS SDK and liquid glass.

I am a small indie developer and need your help keep the lights on. I offer a beautiful app free of ads, subscriptions, trackers and analytics for the absolute best experience for my users. If you are enjoying the puzzles, please support me by purchasing the one-time-only in-app-purchase. This supports development of future updates. You can also leave me a positive rating on the app store as that helps get the word out to others!

Send me feedback at:
pran@pranapps.com

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## More apps by Pranoy Chowdhury

- [Fititude - Cardio, Workout, Exercise tracker and full log with music player for fitness and training](https://appshunter.io/ios/app/fititude-cardio-workout-exercise-tracker-and-full-log-with-music-player-for-fitness-and-training/id952263203)
- [Color Circle - Tap to Switch](https://appshunter.io/ios/app/color-circle-tap-to-switch/id1084246048)
- [Note Flash Music Sight Reading](https://appshunter.io/ios/app/note-flash-music-sight-reading/id1285315687)
- [OLEDify Pure Black Wallpapers](https://appshunter.io/ios/app/oledify-pure-black-wallpapers/id1416984528)
- [Keyboard Warrior Speed Typing](https://appshunter.io/ios/app/keyboard-warrior-speed-typing/id1435547020)
- [MoodWell: moody tracker diary](https://appshunter.io/ios/app/moodwell-moody-tracker-diary/id1443436795)

All apps by Pranoy Chowdhury: https://appshunter.io/developer/952263202

## Related topics

[extreme sudoku](https://appshunter.io/ios/topics/extreme-sudoku) · [sudoku no ads no wifi](https://appshunter.io/ios/topics/sudoku-no-ads-no-wifi)

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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 2026-09-01.*