Killer Sudoku APK: A Fun and Challenging Number Puzzle Game
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.
In this article, we will explain what killer sudoku is, how to play it, and what benefits it has for your brain and mood. We will also share some tips and strategies to help you solve the puzzles faster and easier. Finally, we will review some of the best killer sudoku apps that you can download for free on your Android device.
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What is Killer Sudoku?
Killer sudoku is a variation of the classic number puzzle sudoku, where you have to fill a 9x9 grid with numbers from 1 to 9 without repeating them in any row, column, or 3x3 box. The twist is that the grid is divided into smaller regions called cages, each with a sum in the upper left corner. The numbers in each cage must add up to that sum, and they cannot repeat within the same cage.
Killer sudoku is also known by other names, such as sumdoku, addoku, cross sum, or samunamupure. It was first published in Japan in 1996, and then popularized in the UK by The Times newspaper in 2005. Since then, it has become a worldwide phenomenon among sudoku fans and puzzle lovers.
The difference between Sudoku and Killer Sudoku
Although both sudoku and killer sudoku share a lot of similarities, there is also a major difference: the amount of arithmetic involved. In sudoku, you only need to use logic and deduction to find the missing numbers. In killer sudoku, you also need to use addition and subtraction to figure out the possible combinations for each cage.
Another difference is that killer sudoku puzzles may have no given numbers at all when you start, unlike regular sudoku puzzles that usually have some clues. This makes killer sudoku more challenging and rewarding, as you have to rely on your own skills and reasoning.
Killer Sudoku by Sudoku.com free download
Killer Sudoku puzzle games for Android
Killer Sudoku online - play free Sumdoku
Killer Sudoku - Sudoku Puzzle app for beginners
Killer Sudoku solver - tips and tricks
Killer Sudoku daily challenge - test your skills
Killer Sudoku classic - enjoy the original game
Killer Sudoku pro - advanced puzzles and features
Killer Sudoku offline - play without internet
Killer Sudoku generator - create your own puzzles
Killer Sudoku easy - learn how to play
Killer Sudoku hard - challenge yourself with difficult levels
Killer Sudoku expert - master the ultimate sudoku variant
Killer Sudoku rules - how to solve killer sudoku
Killer Sudoku hints - get help when you are stuck
Killer Sudoku strategies - improve your logic and speed
Killer Sudoku variations - try different types of killer sudoku
Killer Sudoku history - discover the origins of the game
Killer Sudoku statistics - track your progress and achievements
Killer Sudoku leaderboard - compete with other players worldwide
Killer Sudoku themes - customize your game appearance
Killer Sudoku editor - modify existing puzzles or make new ones
Killer Sudoku tutorial - watch videos and learn from experts
Killer Sudoku review - read user feedback and ratings
Killer Sudoku forum - join the community and share your thoughts
Killer Sudoku newsletter - subscribe and get the latest news and updates
Killer Sudoku blog - follow the official blog of the game developer
Killer Sudoku wiki - find out everything you need to know about the game
Killer Sudoku cheat - use a tool to find the solution instantly
Killer Sudoku fun facts - learn some interesting trivia about the game
Killer Sudoku crossword - combine killer sudoku with crossword puzzles
Killer Sudoku brain training - boost your memory and concentration
Killer Sudoku book - buy a collection of killer sudoku puzzles in print
Killer Sudoku magazine - read articles and interviews about the game
Killer Sudoku podcast - listen to discussions and stories about the game
Killer Sudoku merchandise - shop for killer sudoku related products and gifts
Killer Sudoku calendar - get a new killer sudoku puzzle every day of the year
Killer Sudoku wallpaper - download a killer sudoku themed background for your device
Killer Sudoku stickers - decorate your phone or laptop with killer sudoku stickers
Killer Sudoku emoji - express yourself with killer sudoku emoticons
The rules of Killer Sudoku
The rules of killer sudoku are remarkably simple:
Fill each row, column, and 3x3 box with the numbers 1-9 exactly once.
Place numbers in each cage so that they add up to the sum in the upper left corner.
No number can repeat within a cage, a row, a column, or a 3x3 box.
Use logic and avoid guessing.
How to play Killer Sudoku
To play killer sudoku, you need to follow these steps:
Fill the grid with numbers 1-9
The basic rule of killer sudoku is the same as regular sudoku: every row, column, and 3x3 box must contain all the numbers from 1 to 9 exactly once. This is also known as the rule of necessity, as it ensures that there is only one possible solution for each puzzle.
To fill the grid, you need to look for clues and hints that can help you eliminate or confirm certain numbers. For example, if a row has eight numbers filled in already, then the remaining number must be the one that is missing. Similarly, if a column has seven numbers filled in, and two of them are in the same cage, then the other two numbers in that cage must be the ones that are missing from the column.
Pay attention to the cages and their sums
The unique feature of killer sudoku is the presence of cages, which are smaller regions within the grid that have a sum in the upper left corner. The numbers in each cage must add up to that sum, and they cannot repeat within the same cage. This is also known as the rule of uniqueness, as it limits the possible combinations for each cage.
To pay attention to the cages, you need to use addition and subtraction to find out what numbers can go in each cage. For example, if a cage has a sum of 6 and two cells, then the only possible numbers are 1 and 5, or 2 and 4. Similarly, if a cage has a sum of 24 and four cells, then the only possible numbers are 5, 6, 7, and 8.
Use logic and avoid guessing
The final rule of killer sudoku is to use logic and avoid guessing. This is also known as the rule of consistency, as it ensures that you do not make any mistakes or contradictions in your solution. Guessing can lead you to wrong answers or dead ends, which can be frustrating and time-consuming.
To use logic, you need to apply the rules of necessity, uniqueness, and consistency to every cell, cage, row, column, and box in the grid. You also need to look for patterns and relationships between different parts of the grid. For example, if two cages share a common border, then the numbers in those cages cannot be the same. Similarly, if two rows or columns share a common box, then the numbers in those rows or columns cannot be the same.
Killer Sudoku tips and strategies
Now that you know how to play killer sudoku, here are some tips and strategies to help you solve the puzzles faster and easier:
Familiarize yourself with potential number combinations
One of the most useful skills for killer sudoku is to memorize or recognize the potential number combinations for different sums and cell counts. This will help you narrow down your options and eliminate impossible numbers. For example, if a cage has a sum of 15 and three cells, then the only possible combinations are 1-5-9, 2-4-9, 2-5-8, 3-4-8, or 3-5-7.
You can use a table like this one to help you remember the common combinations:
Sum Cells Combinations --- ----- ------------ 3 2 1-2 4 2 1-3 5 2 1-4 6 2 1-5 or 2-4 7 2 1-6 or 2-5 ... ... ... Start with cages with low or high sums
Another useful strategy for killer sudoku is to start with cages that have low or high sums relative to their cell counts. These cages have fewer possible combinations and are easier to fill in. For example, if a cage has a sum of 3 and two cells, then the only possible number is 1-2. Similarly, if a cage has a sum of 17 and two cells, then the only possible number is 8-9.
By starting with these cages, you can quickly fill in some numbers and create more clues for other parts of the grid. You can also use these numbers to eliminate other possibilities in adjacent cages, rows, columns, or boxes.
Apply the 45 rule to reveal hidden numbers
The final tip for killer sudoku is to apply the 45 rule to reveal hidden numbers. The 45 rule is based on the fact that every row, column, or box in a sudoku grid must contain all the numbers from 1 to 9, which add up to 45. Therefore, if you know the sum of a cage and the sum of the row, column, or box that it belongs to, you can subtract them to find the hidden number that is not in the cage.
For example, if a cage has a sum of 12 and three cells, and it is in a row that has a sum of 45, then the hidden number in that row is 45 - 12 = 33. This means that the other six cells in that row must add up to 33, which can help you narrow down your options.
You can also apply the 45 rule to multiple cages in the same row, column, or box. For example, if a box has three cages with sums of 10, 11, and 12, then the hidden number in that box is 45 - (10 + 11 + 12) = 12. This means that the other three cells in that box must add up to 12, which can help you fill in some numbers.
Killer Sudoku benefits
Killer sudoku is not only a fun and challenging game, but also a beneficial one for your brain and mood. Here are some of the benefits of playing killer sudoku regularly:
Train your brain and improve your skills
Killer sudoku is a great way to train your brain and improve your skills in various areas, such as:
Logic and deduction: You need to use logic and deduction to find the missing numbers and eliminate impossible ones.
Arithmetic: You need to use addition and subtraction to calculate the sums and differences of the cages and the grid.
Memory: You need to remember the potential number combinations and the clues that you have found.
Concentration: You need to focus on the puzzle and avoid distractions.
Persistence: You need to keep trying until you solve the puzzle.
By training your brain and improving your skills, you can enhance your cognitive abilities and mental performance. You can also prevent or delay cognitive decline and dementia as you age.
Have fun and enjoy the challenge
Killer sudoku is also a fun and enjoyable game that can boost your mood and happiness. Here are some of the reasons why killer sudoku can make you happy:
Challenge: You can challenge yourself with different levels of difficulty and complexity.
Variety: You can enjoy different types of puzzles and layouts every time you play.
Achievement: You can feel a sense of achievement and satisfaction when you solve a puzzle.
Relaxation: You can relax and unwind by playing a puzzle at your own pace.
Entertainment: You can have fun and entertainment by playing a puzzle anytime and anywhere.
By having fun and enjoying the challenge, you can reduce your stress and anxiety levels. You can also increase your self-esteem and confidence.
Killer Sudoku reviews
If you are interested in playing killer sudoku on your Android device, there are many apps that you can choose from. However, not all apps are created equal. Some may have better features, graphics, or user interface than others. To help you find the best killer sudoku app for you, we have reviewed two of the most popular ones: Killer Sudoku by Sudoku.com and Killer Sudoku! by App Store.
What users say about Killer Sudoku by Sudoku.com
Killer Sudoku by Sudoku.com is one of the most downloaded killer sudoku apps on Google Play. It has over 1 million installs and a rating of 4.6 out of 5 stars. Here are some of the pros and cons of this app according to user reviews:
Pros Cons ---- ---- - It has thousands of puzzles with different levels of difficulty. - It has ads that can be annoying or intrusive. - It has hints, undo, redo, erase, notes, auto-check, statistics, and other helpful features. - It has some bugs or glitches that can affect the gameplay. - It has a simple and elegant design with customizable themes and colors. - It has no option to create or import your own puzzles. What users say about Killer Sudoku! by App Store
Killer Sudoku! by App Store is another popular killer sudoku app on Google Play. It has over 100 thousand installs and a rating of 4.5 out of 5 stars. Here are some of the pros and cons of this app according to user reviews:
Pros Cons ---- ---- - It has hundreds of puzzles with different levels of difficulty. - It has ads that can be removed by paying a fee. - It has hints, undo, redo, notes, auto-fill, auto-check, statistics, and other helpful features. - It has some bugs or glitches that can affect the gameplay. - It has a colorful and attractive design with customizable themes and fonts. - It has no option to create or import your own puzzles. Conclusion
Killer sudoku is a fun and challenging number puzzle game that combines the classic sudoku with the addition game Kakuro. It is a great way to train your brain, improve your skills, have fun, and enjoy the challenge. If you want to play killer sudoku on your Android device, you can download one of the many apps available on Google Play. We recommend Killer Sudoku by Sudoku.com or Killer Sudoku! by App Store, as they have many puzzles, features, and options to suit your preferences.
FAQs
Here are some of the frequently asked questions about killer sudoku:
Q: How hard is killer sudoku?
A: Killer sudoku can be as easy or as hard as you want it to be. Most apps have different levels of difficulty, ranging from easy to expert. You can choose the level that matches your skill and experience. Generally, the harder the level, the fewer clues and more cages there are.
Q: How long does it take to solve a killer sudoku puzzle?
A: The time it takes to solve a killer sudoku puzzle depends on several factors, such as the level of difficulty, the size of the grid, the number of cages, and your own speed and skill. Some puzzles can be solved in a few minutes, while others can take hours or even days.
Q: How do I check if my solution is correct?
A: Most apps have an auto-check feature that can tell you if your solution is correct or not. You can also check your solution manually by adding up the numbers in each cage, row, column, and box. If they all match the sums and rules of killer sudoku, then your solution is correct.
Q: How do I get better at killer sudoku?
A: The best way to get better at killer sudoku is to practice regularly and learn from your mistakes. You can also use some of the tips and strategies that we shared in this article, such as familiarizing yourself with potential number combinations, starting with cages with low or high sums, and applying the 45 rule. You can also watch online tutorials or read books or blogs about killer sudoku.
Q: Where can I find more killer sudoku puzzles?
A: There are many sources where you can find more killer sudoku puzzles, such as:
Apps: You can download one of the many apps that offer killer sudoku puzzles on Google Play or other app stores.
Websites: You can visit one of the many websites that offer killer sudoku puzzles online or for printing.
Books: You can buy one of the many books that offer killer sudoku puzzles in print or digital format.
Newspapers: You can check if your local newspaper offers killer sudoku puzzles in its puzzle section.
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