Killer Sudoku by Sudoku.com

Contains adsIn-app purchases
226K reviews
Content rating
PEGI 3
10M+
Downloads
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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
Killer Sudoku is a classic number puzzle for daily brain and logic training!
Updated on
Oct 29, 2026

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

202K reviews
Stevan Castro
September 18, 2026
It's some of the most fun sudoku I've played app wise. For somebody who can figure them out though through logic easily but can't process information fast participating in the timed ones for medals can be impossible. It's like needing more time in school to finish a test. You know the material you just can't execute it fast. That's the only sucky thing. I don't even really mind the ads. Otherwise it's easily five stars.
8 people found this review helpful
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88GJN89
June 4, 2026
I have been playing this game for a number of years now and highly recommend playing. There is a new puzzle added every day in the daily challenges section and you want to play more the game will generate a new puzzle. There are no pop up ads in this game, you do have the option to watch ads if you need a hint on a puzzle. Every time there has been an issue with the game ive edited this review and the number of stars and the developers have been quick to respond 10/10.
14 people found this review helpful
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Easybrain
June 4, 2026
Hello! Thank you very much for your kind words. It's wonderful to hear how much you enjoy playing and how much you appreciate the daily challenges! We really appreciate your recommendation and are thrilled that you're having a positive experience. Thank you for sharing your feedback, and we hope you continue to have fun with the game!
Alex Merriman
August 10, 2026
Game is good but visuals & layout are terrible. Essential numbers are too small, suggest increase in size when cage is selected. Cage is difficult to see, suggest whole cage highlighted when selected. Game unplayable in monochrome as numbers look the same (black blue red grey). Can't play comfortably one handed on phone having to reach all 4 corners of the screen regularly. Buttons used occasionally are easier to reach than numbers used constantly, swap the rows, make a moveable 3x3 number grid
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Easybrain
August 10, 2026
Hi! Thank you for the detailed feedback. We’re sorry the layout and visuals made the game uncomfortable to play. Your suggestions on number size, cage highlighting, color contrast, button placement, and a movable number grid are very helpful. We’ll share them with the team and keep them in mind for future improvements. Thank you for playing!

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!