Sudoku Extreme: Easy Hard Math

Sudoku Extreme: Easy Hard Math

Classic Number Puzzle Killer

820 ratings
122 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • February 14, 2019
  • August 28, 2026

Features

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Sudoku Extreme: Easy Hard Math screenshot #10 for iPhone
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About

Engage your mind with classic Sudoku puzzles designed for all skill levels. Enjoy a customizable, ad-free experience with various themes and difficulty settings. Track your progress and stats while sharpening your logic skills.

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
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What users say

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+2

What's New in Sudoku Extreme

18

August 28, 2026

- 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

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In-App Purchases

$9.99

Sudoku Extreme Premium

Unlock all levels, themes and remove ads

User reviews

Best sudoku app

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!
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Response from developer

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

Great App Hoping for More Future Updates & Features

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.
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Response from developer

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

Addictive

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.

Response from developer

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)

Kind of disappointing

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.
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Great App Hoping for More Future Updates & Features

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.
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Developer apps

User experience

🐞

Reported Bugs

2 issues

Scoring system inconsistencies at higher levels

Bug

Animation issues causing delays in rapid input

Bug

Requested Features

5 requests

Option to disable auto-fill notes

Feature

Ability to resume unfinished games

Feature

Coloring and advanced note-taking tools

Feature

Sync progress across devices

Feature

Difficulty level selector before starting a game

Feature

FAQ

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.