# Killer Sudoku X — Classic Puzzle, Killer Twist!

> Sudoku puzzle game with classic and 'killer' modes, offering infinite puzzles and statistics. (iPhone/iPad app by Alexander Rote.)

- Source: https://appshunter.io/ios/app/killer-sudoku-x/id960482881 (this page in markdown: same URL + `.md`)
- Developer: [Alexander Rote](https://appshunter.io/developer/960482880)
- Category: Games, Puzzle
- Price: Free
- Rating: 3.13/5 from 8 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 17 MB
- Languages: English
- Released: 2015-02-05
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/killer-sudoku-x/id960482881/reviews.md

## What is Killer Sudoku X?

Killer Sudoku, the classic game of Sudoku with a "Killer" twist!

You play with the same rules of Sudoku, that you have to place the numbers 1 through 9 in each column, row, and outlined 3x3 box, and you can't have repeats. However, smaller boxes around the board will cover some of the squares and are each given a number. Every number in the boxes must add up to that number! Also, no numbers repeat inside these boxes.

Now includes Regular Sudoku. Switch your game mode and play the classic game of Sudoku, using your favorite settings!

Some features include:
- Random puzzle generation, play a nearly infinite number of games
- Two game modes, switch between Killer Sudoku and Regular Sudoku all in the same app
- Four levels of difficulty, fit your own level of gameplay
- Many many statistics, keep track of how you play over time
- Nine color schematics, with suggestions accepted for future updates
- Advanced details, tells you helpful tips for advanced gameplay
- Smart pencil tools, quickly manage the pencil marks and delve into the real logic of the game
- Snapshots, takes a quick picture of the puzzle so you can make a guess, and resets the puzzle back to the way it was if you need it
- Undo and Redo, rewind any number entries, pencil marks, or snapshots

## Key features

- Killer Sudoku mode
- Regular Sudoku mode
- Random puzzle generation
- Four difficulty levels
- Extensive statistics tracking
- Smart pencil tools
- Undo/Redo functionality

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/killer-sudoku-x/id960482881/reviews.md

### 1/5 — Zero stars!

*2019-11-06, version 2.1.1*

Yeah so the start new game button doesn’t work. Deleted.

### 2/5 — Loading, Fun Game, but Imperfect

*2019-06-29, version 2.1*

I have finally gotten this game to load on my iPad mini 5th generation. The Killer Sudoku games (and Killer Sudoku is all that I play, not the regular Sudoku) are fun to play, but they have a major flaw. No game I have played yet has had a unique solution! I get to a point where I have, say, 3-4 in two squares in two rows, and they both are in a place where a total of 7 is needed. It is essential that Killer Sudokus have unique solutions!

Another thing that is needed is a way to check for correctness while playing. Right now, all I can find is that if I put a number in a square that conflicts with another one, both digits get displayed in red. I would like to be able to have all of my answers checked partway through, so that if I am on the wrong track, I can undo or erase the wrong ones before I get too far.

Add the ability to check everything entered, and my rating will go up to 3 stars. Make the Killer Sudoku puzzles have a unique solutioin, and my rating will go up to 4 stars.

Now for some "nice to haves" to bring my rating up to 5 stars, once the above two issues are fixed (any one of these will do it):

1. Add higher difficulties than Hard.

2. On the Hard difficulty (and higher, if this gets added), don't use any single-digit cages.

3. Make the puzzles symmetric.

Take a look at the web sites Killer Sudoku Online and Daily Killer Sudoku for examples of well-designed Killer Sudoku games. (Although web-based, both sites can be played on an iPad or iPhone, and Daily Killer Sudoku can also be played on Android.) All puzzles at Killer Sudoku Online and most at Daily Killer Sudoku are symmetric. I have never come across a puzzle at either site that does not have a unique solution. Both sites have ways to check entries at any point while solving the puzzles.

### 1/5 — Ruined it!

*2019-06-22, version 2.1*

New update ruined this great app. The buttons now occupy more screen space that the 9x9 grid, making it unplayable on my iPad mini

### 5/5 — Awesome!

*2015-02-06, version 1.0*

I've enjoyed playing this app! It's very easy to learn and it's got good features.

### 5/5 — Awesome!

*2015-02-06, version 1.0*

This is best Sudoku app ever! Easy to use and fun!

## Frequently asked questions about Killer Sudoku X

### What are the main game modes in Killer Sudoku X?

Killer Sudoku X offers two primary game modes: Killer Sudoku, which includes the cage sum mechanic, and Regular Sudoku, for a classic experience. You can easily switch between them within the app.

### How many puzzles can I play in Killer Sudoku X?

The app features random puzzle generation, meaning you can play a nearly infinite number of unique games. This ensures you'll always have a new challenge waiting for you.

### What difficulty levels are available in Killer Sudoku X?

Killer Sudoku X provides four distinct levels of difficulty, allowing players to tailor the gameplay to their skill level. This makes the game suitable for both beginners and experienced Sudoku players.

### Does Killer Sudoku X track my progress?

Yes, the app includes many statistics to keep track of how you play over time. This feature helps you monitor your improvement and understand your gameplay patterns.

### Can I get hints or tips in Killer Sudoku X?

Killer Sudoku X includes advanced details that offer helpful tips for advanced gameplay. Additionally, smart pencil tools assist in managing pencil marks and delving into the game's logic.

### What platforms is Killer Sudoku X available on?

Killer Sudoku X is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system.

### How often is Killer Sudoku X updated?

The last update for Killer Sudoku X was on July 1, 2019, with version 2.1.1. While the developer accepts suggestions for future updates, the current update frequency is not explicitly stated.

### What is the age rating for Killer Sudoku X?

Killer Sudoku X has an age rating of 4+, making it suitable for a wide range of players. The game's content is considered appropriate for young children and older audiences alike.

## Version history (last 1 release)

### 2.1.1 — 2019-07-01

Update 2.1 introduces the much-requested Undo/Redo buttons. Optimizations and enhancements also make the Snapshot feature much faster. This update also features some visual enhancements for iPad support. Finally, pair these features with the latest color scheme that's sure to brighten your day, Summer Skies!

This hotfix resolves a couple issues that have been reported.

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## More apps by Alexander Rote

- [VolleyStats Player Tracker](https://appshunter.io/ios/app/volleystats-player-tracker/id1484020073)

All apps by Alexander Rote: https://appshunter.io/developer/960482880

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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 2026-06-10.*