Sudoku Extreme: Easy Hard Math

Sudoku Extreme: Easy Hard Math

Classic Number Puzzle Killer

827 ratings
125 reviews
Free
In-App Purchases

Details

Released
February 14, 2019
Updated
October 19, 2026

Features

Sudoku Extreme: Easy Hard Math screenshot #1 for iPhone
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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 about Sudoku Extreme

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What's New in Sudoku Extreme

22

October 19, 2026

- Updated to iOS 27 SDK. - My game has over 100,000 puzzles in 6 difficulty levels. I don't use intrusive ads, trackers, subscriptions, or other nonsense. Only 0.2% of players in the last month chose to support this game via the one-time purchase. As a solo indie developer, it's unsustainable and that doesn't cover the ongoing costs of developing and maintaining the game. With this update, nothing changes for Pro users. Free users can try out all difficulty levels and customizations during the free trial. A one-time-only purchase unlocks over 100,000 puzzles and all difficulty levels for lifetime. It also helps me keep the game ad-free. No subscription. It's a small and fair amount which helps cover development costs of future updates. Thank you for supporting me. Hope you are enjoying the puzzles :) Send me feedback at: pran@pranapps.com

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3

Subscriptions & In-App Purchases

$4.99

Sudoku Extreme Premium

Unlock all levels, themes and remove ads

User reviews

Some good accessibility features, room for improvement

No white flashes on startup and has dark mode and light mode themes. Lots of customizable settings that are immediately available with no searching but the wall of text might be best organized with headers. But there is one big issue.
There is a bug where puzzles get wiped when you leave them and you don't get the opportunity to resume them. And it has nothing to do with changing difficulties. Sent a screen recording when dev asked. Developer did not fully watch it or they would have not responded to me saying it was because I switched difficulties (and even it was, that means the game punishes players who get better or want to take it easier; that is still a bug).
Also intelligent hints would be good down the line.
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Response from developer

Thanks for reaching out. When you switch difficulty level, it clears out the previous game because otherwise, it'd be confusing seeing for example a previous Easy game when you have switched to a Medium difficulty. It also clears out the previous game if you change a setting which may impact the puzzle (for same reason of preventing confusion). However, I will add a setting to prevent this behavior. I opted for all settings available in the settings screen at once so as to prevent having to click through multiple pages to find a setting. But I do plan on adding headers and a search feature to easily find the setting in there and better organization. Detailed hints are also on my todo list. I will be adding it in an update.

Unnötige Vorgabe + unrealistische Auswertung

Es sollten beim Spielen nicht alle Möglichkeiten der Feldzahlen angegeben werden.

Außerdem scheint die Auswertungsstatistik unrealistische Ergebnisse zu beinhalten: Wer schafft es, ein (mittelschweres) Sudoku in 00:01 zu lösen? Das geht schon allein wegen der Schnelligkeit der manuellen Eingabe nicht!
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Response from developer

Hello, I apologize for having a hard time understanding the issue as I don't understand German. However, based upon Google Translate, if I am understanding correctly, you have 2 issues which I address below: 1. Your first issue is "Not all possible cell values ​​should be specified during gameplay" Is this referring to the notes? If so, you can easily disable auto-filling of notes in settings. 2. Your second issue is "Furthermore, the evaluation statistics seem to include unrealistic results: Who can solve a (medium-difficulty) Sudoku in 00:01?" The score is simply telling you how fast the quickest cell was solved (not the whole puzzle). Cells which only have 1 possible result (when all other numbers have been used in the row, column and block) can in fact be filled in 1 second by long pressing the cell. Long pressing a cell auto fills that cell when only 1 possible number is remaining. I hope this answers your question and you update your review. If you still have questions or if I didn't understand your issue correctly, please email me at: pran@pranapps.com

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

Super Sudoku App

Die App ist super. Sie sieht gut aus und man kann viele Dinge anpassen und ändern. Ich nutze sie mittlerweile seit Jahren und kann sie jedem der Sudoku mag empfehlen.

Der Entwickler ist sehr nett und reagiert super schnell auf Nachrichten.

Response from developer

Thank you!

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.