Killer Sudoku by Sudoku.com

Contains adsIn-app purchases
4.1
209K reviews
10M+
Downloads
Content rating
PEGI 3
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About this game

Killer Sudoku will let you enjoy an exciting experience! Jump into the new Sudoku gameplay, solve tons of new challenging number puzzles, and train your brain! Install Killer Sudoku now for free!

This free Killer Sudoku app comes from the developer of the world’s most downloaded classic Sudoku puzzle – Sudoku.com. So a stellar experience, extra game quality, and endless fun are guaranteed.

Whether you’re a fan of classic Sudoku or just looking for a number game or math puzzle for a great time and mental workout, free Killer Sudoku is here for you.

Although Killer Sudoku seems a bit harder than classic Sudoku, we made it accessible for players of all skill levels. This number puzzle game comes with several difficulty levels – easy, medium, hard, and expert Killer Sudoku. This way, Killer Sudoku puzzles are great for both beginners and advanced Sudoku solvers. We have no doubt you’ll become a Killer Sudoku master in no time!

What is Killer Sudoku

Killer Sudoku is a true legend among number games and puzzles. In a nutshell, it’s a perfect blend of those fave brain-twisters Sudoku and Kakuro. Absolutely free!

This number puzzle goes by many names: Sumdoku, Addoku, Cross Sum, etc., but the rules are equally simple across the board. Your goal is to fill the grid with numbers like in classic Sudoku while making sure the sum of numbers in the cages (areas separated by dotted lines) is equal to the number in the upper left corner of that cage. Still sounds complicated? Let’s review the Killer Sudoku rules in detail.

How to play Killer Sudoku

✓ Fill all rows, columns, and 3x3 blocks with numbers 1-9 exactly like in classic Sudoku
✓ Pay attention to the cages – groups of cells indicated by dotted lines.
✓ Make sure the sum of numbers in each cage is equal to the number in the upper left corner of the cage.
✓ The basic rule of Killer Sudoku is that the sum of all numbers in each 3x3 block, row, or column always equals 45.
✓ Numbers cannot repeat within cages, a single row, column, or 3x3 region.

Killer Sudoku features

✓ Complete free Killer Sudoku Daily Challenges to compete for awards
✓ Take part in Seasonal Killer Sudoku Events and win unique medals
✓ Challenge your logic figuring out where you went wrong, or enable Auto-Check to see your mistakes
✓ Add notes if you’re not sure which number to place. Enjoy the experience of the classic paper-and-pen puzzle games.
✓ Use hints when stuck on a really hard number puzzle. Don’t bother if you’re an experienced Killer Sudoku solver.

More Killer Sudoku features

- Statistics. Track your daily Killer Sudoku progress, best time, and other achievements
- Unlimited Undo. Made a mistake? No worries, undo it in one tap
- Color themes. Select classic Light, Dark, or Sepia themes to design your own Killer Sudoku kingdom!
- Auto-save. If you get distracted and quit your Killer Sudoku game unfinished, we’ll save it for you so you can continue anytime.
- Eraser. Erase any mistakes you made in a number puzzle.

Killer Sudoku is now available on the vast majority of phones and tablets. Install Killer Sudoku for free, train your brain, and have fun along the way!

Terms of Use:
https://easybrain.com/terms

Privacy Policy:
https://easybrain.com/privacy
Updated on
Oct 20, 2025
Available on
Android, Windows*
*Powered by Intel® technology

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, Financial info and 3 others
This app may collect these data types
Location, Financial info and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.1
187K reviews
Adamm1726
October 13, 2025
I was able to put up with the intrusive mid game ads most would be put off by. But now you NEED to click on them and go to the play store just to go back to the game? No exit button on the ad? is that even legal??? Absolutely not putting up with it. If you're interested in the type of game, there are better, less intrusive/harassing apps to play it on. Absolutely ridiculous.
10 people found this review helpful
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Easybrain
October 13, 2025
Hi! Thank you for your feedback. We acknowledge that the rise in ads has affected your experience. Your input is valuable as we strive to improve the balance between gameplay and advertisements. If you face an unskippable ad or any issues, please share a screenshot via the "Help" section in the app. We’ll look into it.
Carly Maryhew
May 23, 2025
A good Killer Sudoku app. The different color schemes are useful, as well as the options for how things get highlighted (or not), etc. While I like the idea of the weekly challenges, the vast majority involve non-expert levels which are ridiculously easy. Basically doing simple math for several minutes, which quickly becomes tedious after a few games. There should also be a difficulty level between Hard and Expert. Perhaps also empty, but with more of the easier (high or low) totals per cage.
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Joris Witteveen
August 5, 2025
after reading the reviews I noticed that the devs have been claiming to make the massive ad issue better for a couple years now but it's only gotten significantly worse. I remember only getting an ad at the beginning/end of a puzzle. now even on easy you're forced to watch 4 highly disruptive ads in the middle of your game. Mind you the remove ads option is €11, which in my opinion is simply too steep
2 people found this review helpful
Did you find this helpful?
Easybrain
August 5, 2025
Hi! Thanks for your feedback! We understand how frustrating the ad experience can be. While ads help keep the app free for everyone, we’re continuously testing ways to improve the balance between monetisation and player experience.

What’s new

We hope you enjoy playing Killer Sudoku. We read all your reviews carefully to make the game even better. Please leave your feedback on why you love the game and what you'd like to improve. Keep your mind active with Killer Sudoku!