Killer Sudoku by Sudoku.com - Logic puzzles & numbers

If you are seeking an exhilarating experience, immerse yourself in the novel world of Killer Sudoku! Dive into a fresh Sudoku gameplay, conquer numerous challenging number puzzles, and boost your cognitive skills! Get Killer Sudoku for free now!

This complimentary Killer Sudoku app is crafted by the same developer behind the globally renowned classic Sudoku puzzle on Sudoku.com. Hence, expect a top-notch experience, superior game quality, and endless entertainment. Whether you adore classic Sudoku or crave a stimulating number game or math puzzle for relaxation and mental exercise, Killer Sudoku is at your service.

While Killer Sudoku may appear more demanding than classic Sudoku, it has been tailored to cater to players of all proficiency levels. With varying difficulty levels – easy, medium, hard, and expert Killer Sudoku – this number puzzle accommodates beginners and seasoned Sudoku enthusiasts alike. You'll swiftly transition into becoming a proficient Killer Sudoku solver!

About Killer Sudoku by Sudoku.com

Killer Sudoku by Sudoku.com is, as its name suggests, an app with which you can test your brain by completing sudokus. Get ready to solve increasingly challenging puzzles from the comfort of your own Android.

As usual, the rules in Killer Sudoku by Sudoku.com are the same as always. That is, your goal is to fill in the grids with the corresponding numbers. Note that the number in each cell must be equal to the number shown in the upper left corner of the cage.

This app respects classic Sudoku rules, so you shouldn't encounter any difficulties. Precisely for this reason, in Killer Sudoku by Sudoku.com, you'll need to fill in all the rows, columns, and 3x3 blocks with numbers from 1 to 9. Pay attention to the cages. As mentioned above, the numbers in each cell should be equal to the numbers in the upper left corner of the cage. Numbers can never repeat within a cage, row, column, or 3x3 block. Best of all, all you have to do is tap on the boxes where you want to add the numbers.

Killer Sudoku by Sudoku.com is a very interesting title with which you can keep yourself entertained by solving increasingly challenging sudokus.

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Keep your mind active with Killer Sudoku!

What is Killer Sudoku?

Killer Sudoku is a fun twist on the classic sudoku for those of you seeking something new and challenging. It’s also known by such names as sumdoku, addoku and sumoku puzzle but in a nutshell it’s pretty much the same number puzzle.

What’s the difference between Sudoku and Killer Sudoku?

Although both number puzzles share a lot of similarities, there’s also a major difference – amount of arithmetics involved.  

In Killer Sudoku there’s a new concept of a “cage” – a group of cells within a dotted line that make up a sum shown as a small number above. Like in Sudoku, your ultimate goal is to fill the grid with numbers, while paying attention to ”the sum rule”. Let’s review Killer Sudoku rules in detail below.

Are Killer Sudoku rules hard?

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

The best Killer Sudoku tactic

One of the best-kept secrets to solving Killer Sudoku is the so-called “45 rule”. As we know from the rules, each block, row or column shall contain all numbers from 1 to 9, making it 45 in total. By knowing this and subtracting the sums of cages we can reveal additional numbers. Let’s see this in action.

The sum of all numbers in the right upper 3x3 block is equal to 45. We also see several cages in that block – 17, 16, 7 and 3. By subtracting them from 45 we’ll get the value of the bottom-left cell: 45 - 17 - 16 - 7 - 3 = 2. The sum of this cage is 9 and we can instantly fill in another cell – 9 - 2 = 7. This way, by applying the “45 rule” we filled two numbers on the empty grid and are off to a good start!

Why you should play Killer Sudoku

Solving Killer Sudoku online has a lot of benefits. Daily Killer Sudoku sessions are said to help you train your brain, improve memory, concentration and logical thinking. If these practical reasons aren’t enough for you, Killer Sudoku is a fun time-killer too! Whether you’re waiting for plane boarding, stuck in a queue or just want to unplug from reality for a few minutes, Killer Sudoku should be your number puzzle of choice.

Killer Sudoku Overview

Killer Sudoku stands out as a legendary figure among number games and puzzles. In essence, it seamlessly combines the charm of beloved brain teasers like Sudoku and Kakuro. And it won't cost you a penny!

This number puzzle might go by different names such as Sumdoku, Addoku, Cross Sum, and others, but the rules remain uniform across the board. The objective is to fill the grid with numbers akin to classic Sudoku while ensuring that the sum of numbers in the cages (sections separated by dotted lines) matches the number in the top-left corner of that cage. Seemingly complex? Let's delve into the details of the Killer Sudoku rules.

How to Play Killer Sudoku

- Fill all rows, columns, and 3x3 blocks with numbers 1-9 as in classic Sudoku.

- Pay attention to cages - sets of cells demarcated by dotted lines.

- Confirm that the total of numbers in each cage equals the number in its top-left corner.

- The fundamental rule of Killer Sudoku stipulates that the sum of all numbers in each 3x3 block, row, or column always adds up to 45.

- Avoid repeating numbers within cages, single rows, columns, or 3x3 sections.

Features of Killer Sudoku

- Engage in free Killer Sudoku Daily Challenges to vie for rewards.

- Participate in Seasonal Killer Sudoku Events and earn exclusive medals.

- Test your logic skills by pinpointing errors or utilize Auto-Check to identify mistakes.

- Take notes if uncertain about number placements for a taste of traditional paper-and-pencil puzzle activities.

- Seek hints when grappling with challenging number puzzles. No worries if you're a seasoned Killer Sudoku aficionado.

Additional Killer Sudoku Features

- Statistics: Monitor your daily Killer Sudoku progress, best time, and other accomplishments.

- Unlimited Undo: Made an error? Easily rectify it with a single tap.

- Color Themes: Choose between classic Light, Dark, or Sepia themes to personalize your Killer Sudoku realm!

- Auto-Save: If you get sidetracked and exit your unfinished Killer Sudoku game, rest assured it will be saved so you can resume at any time.

- Eraser: Eliminate any inaccuracies in a number puzzle with ease.

Killer Sudoku is conveniently accessible on the majority of smartphones and tablets. Install Killer Sudoku for free, stimulate your mind, and relish the journey!