# Killer Sudoku - Brain Games — Board puzzles for mindfulness

> Logic-based number placement puzzle game for brain training and entertainment. (iPhone/iPad app by Oakever Games.)

- Source: https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340 (this page in markdown: same URL + `.md`)
- Developer: [Oakever Games](https://appshunter.io/developer/1658671470)
- Category: Games, Utilities, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 4.70/5 from 26,573 App Store ratings · 385 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 253 MB
- Languages: American English, Afrikaans, Amharic, Arabic, Azerbaijani, Belarusian, Bangla, Bosnian, Khmer, Catalan and 50 more
- Released: 2020-09-27
- Data updated: 2026-09-01
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340/reviews.md

## What is Killer Sudoku?

Sudoku Free Puzzle Game is a welcomed and addictive Brain Sudoku puzzle game on App Store. You can download Sudoku free app for your iPhone. You get  5000+ challenging Sudoku puzzles everyday to one true solution. Killer Sudoku the best puzzle game for your brain, logical thinking, memory, and A GOOD TIME KILLER!

Killer Sudoku is a logic-based number puzzle game and the goal is to place 1 to 9 digit numbers into each grid cell so that each number can only appear once in each row, each column and each mini-grid. With our Sudoku puzzle app, you can not only enjoy sudoku games anytime anywhere, but also learn Sudoku techniques from it.

Key Features
1. Sudoku puzzles come in 4 difficulty levels - easy Sudoku, medium Sudoku, hard Sudoku and expert Sudoku! Perfect for Sudoku beginners and advanced players!
2. Daily Challenges - Complete Daily Challenges and collect trophies.
3. Pencil Mode - Turn on / off pencil mode as you like.
4. Highlight Duplicates - to avoid repeating numbers in a row, column and block.
5. Intelligent Hints - guide you through the numbers when you get stuck
6. Themes - Choose the theme that makes it easier for your eyes.
7. Long press to fill quickly

On this Brain Sudoku free app, you are also able to
1. Turn on / off sound effects
2. Turn on / off Highlight identical numbers
3. Auto remove notes from all columns, rows and blocks once the number is placed
4. Unlimited undo & redo
5. Auto-save-Pause the game and resume the game without losing any progress
6. Sudoku online & Sudoku offline

You may also find the following Brain Sudoku features useful
1. You can share to your friends via Google+, Facebook, Twitter etc..
2. Use dark mode to protect your eyes
3. Turn on / off timer when you play the sudoku puzzle
4. 100 new sudoku puzzles every week.
5. New types of Sudoku puzzles, like Killer sudoku, letter Sudoku, will be available.
6. Good gameplay
7. Intuitive interface
8. Easy tools, easy control
9. Clear layout


Our free Sudoku puzzle app has intuitive interface, easy control, clear layout and well balanced difficulty levels for beginners and advanced players. It’s not only a good time killer but also helps you think, makes you more logical and have better memory.

When you first open our Sudoku app, you see a guide tour teaching you how to play Sudoku and when you open the puzzle game app for the 100th time, you can see yourself a Sudoku master and a great Sudoku solver. You’d be able to play any web sudoku fast. Come to our Kingdom of Sudoku and keep your mind sharp.

If you have any idea for our Sudoku puzzle game app, or if you have any question about Sudoku and you want to discuss with us, please send us emails at support@oakevergames.com. We are always here for you.

Privacy Policy: https://oakevergames.com/pp.html
Terms of Service: https://oakevergames.com/tos.html
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

## Key features

- Multiple difficulty levels
- Daily challenges and trophies
- Pencil mode for notes
- Highlight duplicate numbers
- Intelligent hint system
- Customizable themes
- Unlimited undo/redo

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Sudoku Weekly Subscription | $1.99 | per 7 days |
| Sudoku Monthly Subscription | $4.99 | per month |
| Sudoku Yearly Subscription | $15.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Battle Tickets *30 | $0.99 | one-time |
| Battle Tickets *100 | $1.99 | one-time |
| Battle Tickets *200 | $2.99 | one-time |


## What do users think of Killer Sudoku?

Overall sentiment: negative

**Pros**

- 🚀 Great game
- 💡 Challenging and makes you think
- 👍 Variety and challenge
- 👍 Stimulating brain workout

**Cons**

- 🐛 Freezing and crashing issues
- 🔋 Battery drain
- 💸 Too many intrusive ads
- 💸 Expensive subscription to remove ads
- 🐛 Bugs and glitches
- 🐛 Losing progress and data

**Commonly reported bugs**

- Game freezing and crashing
- Ads causing issues and preventing gameplay
- Losing progress and data after updates
- Numbers not showing up in puzzles
- Battle mode bugs and glitches

**Most requested features**

- Option to turn off timer
- More note-taking options
- Ability to choose difficulty level for daily challenges
- Bring back seasonal challenges
- Improve battle mode matchmaking and ad issues

## Recent user reviews (10 of 385)

All indexed reviews: https://appshunter.io/ios/app/killer-sudoku-brain-games/id1532397340/reviews.md

### 1/5 — Used to be Good

*2026-08-23, version 3.6.2*

Sorry to say but forced adds is NOT cool. Getting worse recently. Sad to leave but it is not enjoyable playing it anymore.

### 1/5 — Constant ad interruptions

*2026-08-13, version 3.5.12*

This game used to be fine. Now, they constantly interrupt play with a forced ad!! I MEAN every few minutes, if not every minute!!  You then have to click out of it and wait for the game to load again!! I’m finding a new one. This one sucks!!

### 1/5 — Intrusive Ads

*2026-08-12, version 3.5.12*

Before you get stuck in a loop of “ads” which are just other games, it’s quite fun.

But once they send you down that ad loop, there’s no escape. You play a different game and there’s no exit button. You close the app, and it just sends you back.

### 1/5 — Ads ads ads

*2026-08-09, version 3.5.12*

Too many ads and ridiculously layered, tiny, repetitive x ads. Ironically, many ads state the advertised game has no ads. Also, why is the pencil in different places?

### 2/5 — Interrupting ads

*2026-08-08, version 3.5.12*

I’ve played this game for a long time. Recently you’ve started ads right in the middle of play. This is disruptive and annoying and if you don’t fix it I’m out

### 5/5 — Long time player of this app… will not allow to write review….It is great gam

*2026-07-24, version 3.5.10*

I am in! I love this version of this type of game. I think this app is trying to protect us from voracious, misleading adds based on their game not having adds. I agreed to watch adds to play. I did not agree to participate with adds ….much less those designed to make it difficult to hang up without having your device taken hostage. This requires leaving the game, turning off search engine or App Store, then return to game and try to turn the add off again,
. I have had this happen up to 6x from Junes Journey and Amazon adds. NOT ON THIS SITE! THANK YOU!Thank you!

### 1/5 — Voller Spam-Werbung

*2026-07-03*

Das Spiel selbst ist in Ordnung. Aber man wird ständig mit betrügerischer Werbung für irgendwelche Fake-Wunderprodukte belästigt, die man auch nicht ordentlich melden kann. In den Privacy-Einstellungen kann man zwar ausschalten, dass Anbieter mit „berechtigtem Interesse“ Daten abgreifen können, aber die Einstellung lässt sich nicht speichern. Unklar, ob das Absicht oder schlechte Programmierung ist, in jedem Fall ist das nicht in Ordnung.

### 3/5 — If you don’t watch the ads, your winning games will turn into loses

*2026-06-20, version 3.5.5*

Very greedy

### 4/5 — Recent changes

*2026-06-01, version 3.5.1*

Loved this game because it only gave advertisements between games. I wouldn’t mind several (3?) between games. Now doing a killer it breaks away every couple of minutes while you are trying to think. I may continue to do the daily but am looking for a different app now.

### 5/5 — Отлично, но…

*2026-05-24*

Приложение отличное! Уже несколько дет играю только в нем. Но после обновления в ежедневных заданиях появляется только легкий уровень сложности! Раньше у меня был уровень Киллер. Сейчас не интересно. Сделайте возможность выбора себе уровня в ежедневном задании или хотя бы из последнего выполненного!

## Frequently asked questions about Killer Sudoku

### What is this app about?

This app is a logic-based number puzzle game where the goal is to place digits 1 through 9 into a grid. Each number must appear only once in each row, column, and mini-grid. It's designed to be a brain game that enhances logical thinking and memory.

### What are the key features of this Sudoku app?

Key features include puzzles across four difficulty levels (easy to expert), daily challenges with trophies, a pencil mode for notes, duplicate highlighting to prevent errors, intelligent hints, customizable themes, and quick filling options. It also offers unlimited undo/redo and auto-save functionality.

### Is this app free to play?

Yes, the app is free to download and play. It offers a large number of challenging puzzles daily. While the core game is free, it does include in-app purchases and advertisements.

### Can I play this game offline?

Yes, the app supports both online and offline play. You can enjoy the Sudoku puzzles anytime and anywhere, whether you have an internet connection or not, without losing your progress.

### Who is this app designed for?

This app is suitable for both Sudoku beginners and advanced players. It's designed for anyone who enjoys logic puzzles, wants to improve their cognitive skills, or is looking for a mentally stimulating way to pass the time.

## Version history (last 5 releases)

### 3.6.3 — 2026-08-26

- Bug fixes and performance improvements.

### 3.6.2 — 2026-08-22

- Bug fixes and performance improvements.

### 3.6.1 — 2026-08-19

- Bug fixes and performance improvements.

### 3.6.0 — 2026-08-14

- Bug fixes and performance improvements.

### 3.5.12 — 2026-07-31

- Bug fixes and performance improvements.

## Apps similar to Killer Sudoku

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sudoku - Brain Puzzle Games](https://appshunter.io/ios/app/sudoku-brain-puzzle-games/id1442749804) | 4.8 (306,510) | Free | Games |
| [Sudoku Puzzle - Brain Games](https://appshunter.io/ios/app/sudoku-puzzle-brain-games/id1492978794) | 4.9 (88,339) | Free | Games |
| [Sudoku.com - Number Games](https://appshunter.io/ios/app/sudokucom-number-games/id1193508329) | 4.8 (1,847,599) | Free | Games |
| [Logic Riddle-Puzzle Games](https://appshunter.io/ios/app/logic-riddle-puzzle-games/id1594607267) | 4.7 (23,376) | Free | Games |
| [Brain Puzzle Games for Adults](https://appshunter.io/ios/app/brain-puzzle-games-for-adults/id887025430) | 4.3 (17,564) | Free | Games |
| [Brain Games - Left vs Right](https://appshunter.io/ios/app/brain-games-left-vs-right/id576395411) | 4.7 (24,696) | Free | Games |

## More apps by Oakever Games

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- [Paint by Number Coloring Game](https://appshunter.io/ios/app/paint-by-number-coloring-game/id1420058690)
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- [Sudoku - Brain Puzzle Games](https://appshunter.io/ios/app/sudoku-brain-puzzle-games/id1442749804)
- [Wood Block Puzzle Games](https://appshunter.io/ios/app/wood-block-puzzle-games/id1466197423)

All apps by Oakever Games: https://appshunter.io/developer/1658671470

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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.*