How to Master Killer Sudoku - Download the Best Free App and Learn the Tricks
Download Killer Sudoku Free: How to Enjoy the Fun and Challenging Number Puzzle Online
If you love sudoku but are looking for something more challenging, killer sudoku is the perfect game to try. Killer sudoku combines the classic puzzle with the addition game Kakuro to limit where you place numbers even more. While they may seem tough, youll be able to logic your way through any puzzle once you know its tricks.
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In this article, we will explain what killer sudoku is, how to play it online for free, and how to solve it using some tips and strategies. By the end of this article, you will be ready to download killer sudoku free and enjoy this fun and challenging number puzzle online.
What is Killer Sudoku?
Killer Sudoku is a fun twist on the classic sudoku for those of you seeking something new and challenging. Its also known by such names as sumdoku, addoku and sumoku puzzle but in a nutshell its pretty much the same number puzzle.
The difference between Sudoku and Killer Sudoku
Although both number puzzles share a lot of similarities, theres also a major difference amount of arithmetics involved. In Killer Sudoku theres 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.
The rules of Killer Sudoku
The concrete rules of killer sudoku are as thus:
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Fill all rows, columns and 3x3 region with numbers exactly like in regular sudoku.
Every cell is a part of a cage, indicated by colors.
Make sure the cells can be added up to the sum of its cage.
No number appears more than once in a cage. (This is the standard rule for killer sudokus, and implies that no cage can include more than 9 cells.)
How to play Killer Sudoku online for free
Playing killer sudoku online for free is easy and convenient. You don't need to buy any books or magazines, or print any puzzles. You just need a device with an internet connection and a browser. You can play killer sudoku online anytime and anywhere, whether you're at home, at work, or on the go.
The benefits of playing Killer Sudoku online
Playing 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 arent enough for you, killer sudoku is a fun time-killer too! Whether youre 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.
The best Killer Sudoku tactic: the 45 rule
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. Lets 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 get 2. This means that the remaining cell in that block must be 2. This is a simple example, but you can use the 45 rule to find more numbers in more complex puzzles.
The best websites to play Killer Sudoku online for free
There are many websites that offer killer sudoku puzzles online for free, but not all of them are equally good. Some of them may have poor design, annoying ads, or limited features. To help you find the best websites to play killer sudoku online for free, we have compiled a list of our favorites:
- Over 10,000 puzzles of different sizes and difficulties- Daily puzzles and weekly competitions- Hints, notes, and undo/redo options- Statistics and leaderboards- Printable puzzles
- A new puzzle every day with four difficulty levels- Timer and score system- Auto-fill option for sums and candidates- Save and resume feature- Archive of previous puzzles
- Hundreds of puzzles with five difficulty levels- Customizable grid size and color scheme- Auto-check and auto-correct options- Hints and solutions- No ads or registration required
How to solve Killer Sudoku puzzles
Solving killer sudoku puzzles may seem daunting at first, but with some practice and patience, you will be able to master them. Here are some tips and strategies to help you solve killer sudoku puzzles:
Familiarize yourself with potential number combinations for cages
One of the most useful skills for solving killer sudoku puzzles is knowing the possible number combinations for each cage sum. For example, if you see a cage with a sum of 3 and two cells, you know that the only possible combination is 1 and 2. If you see a cage with a sum of 17 and three cells, you know that the possible combinations are 6-5-6, 7-5-5, 8-4-5, or 9-4-4. Knowing these combinations will help you eliminate candidates and find numbers faster.
Start with cages with really low or really high sums
A good way to start solving a killer sudoku puzzle is to look for cages with really low or really high sums. These cages are easier to fill because they have fewer possible number combinations. For example, if you see a cage with a sum of 6 and four cells, you know that the only possible combination is 1-1-1-3. If you see a cage with a sum of 30 and four cells, you know that the only possible combination is 9-8-7-6. Filling these cages will help you create more clues and constraints for the rest of the puzzle.
Use logic to find hidden singles and naked pairs
Another useful technique for solving killer sudoku puzzles is to use logic to find hidden singles and naked pairs. Hidden singles are numbers that can only go in one cell in a row, column, or block, even though they may appear as candidates in other cells. Naked pairs are two numbers that can only go in two cells in a row, column, or block, even though they may appear as candidates in other cells. Finding hidden singles and naked pairs will help you eliminate candidates and find numbers easier.
Killer sudoku is a fun and challenging number puzzle that combines the classic sudoku with the addition game Kakuro. It has some additional rules that limit where you place numbers even more. You can play killer sudoku online for free on many websites that offer different features and options. You can also solve killer sudoku puzzles using some tips and strategies, such as the 45 rule, potential number combinations, hidden singles, and naked pairs.
If you are ready to download killer sudoku free and enjoy this fun and challenging number puzzle online, check out our recommended websites above and start playing today. You will be amazed by how much fun and satisfaction you can get from solving killer sudoku puzzles.
What is the difference between killer sudoku and regular sudoku?Killer sudoku is a variation of regular sudoku that adds cages with sums to the grid. You have to fill the grid with numbers from 1 to 9 without repeating them in any row, column, or block, and also make sure that the numbers in each cage add up to the given sum.
How do you solve killer sudoku puzzles?You can solve killer sudoku puzzles by using logic and deduction, as well as some tips and strategies, such as