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Hard Sudoku APK: Challenge Your Brain with 10,000+ Classic Number Games


Hard Sudoku APK: A Challenging and Fun Number Game for Android




If you are looking for a brain-teasing and addictive number game for your Android device, you might want to try Hard Sudoku APK. This is a free app that offers thousands of classic sudoku puzzles with different difficulty levels, from easy to giant. In this article, we will explain what sudoku is, what Hard Sudoku APK is, and how to download and install it on your Android device. We will also give you some tips to solve hard sudoku puzzles and some sources to find more of them.


What is Sudoku?




Sudoku is a popular logic-based number game that originated in Japan. The goal of sudoku is to fill a 9x9 grid with numbers from 1 to 9, such that each row, column, and 3x3 subgrid contains each number exactly once. Sudoku puzzles have a unique solution that can be reached by using logic and deduction, without guessing or trial and error.




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The rules of Sudoku




The rules of sudoku are simple, but the puzzles can be very challenging. Here are the basic rules of sudoku:



  • The grid consists of 81 cells, divided into nine rows, nine columns, and nine 3x3 subgrids.



  • Some cells are pre-filled with numbers, called clues or givens. The number of clues varies depending on the difficulty level of the puzzle.



  • The player has to fill in the empty cells with numbers from 1 to 9, following these constraints:



  • Each row must contain each number from 1 to 9 exactly once.



  • Each column must contain each number from 1 to 9 exactly once.



  • Each 3x3 subgrid must contain each number from 1 to 9 exactly once.



The benefits of Sudoku




Sudoku is not only a fun and entertaining game, but also a beneficial one for your brain and mental health. Here are some of the benefits of sudoku:



  • It improves your logical thinking and problem-solving skills, as you have to use deductive reasoning and eliminate possibilities to find the solution.



  • It enhances your memory and concentration, as you have to keep track of the numbers and their positions in the grid.



  • It reduces stress and anxiety, as it distracts you from your worries and provides you with a sense of achievement and satisfaction.



  • It prevents cognitive decline and dementia, as it stimulates your brain cells and keeps them active and healthy.



What is Hard Sudoku APK?




Hard Sudoku APK is a free app that allows you to play sudoku on your Android device. It is developed by Easybrain, a company that specializes in creating puzzle games for mobile platforms. Hard Sudoku APK has more than 10,000 classic sudoku puzzles with six difficulty levels: fast, easy, medium, hard, expert, and giant. You can choose any level you like, depending on your mood and skill level.


The features of Hard Sudoku APK




Hard Sudoku APK has some features that make this app stand out from other sudoku apps. Here are some of the features of Hard Sudoku APK:


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  • It has a simple and user-friendly interface that allows you to play sudoku with ease and comfort.



  • It has an auto-save function that saves your progress automatically, so you can resume your game anytime.



  • It has an undo button that lets you undo your mistakes quickly and easily.



  • It has a hint button that gives you a clue It has a hint button that gives you a clue when you are stuck, without revealing the whole answer.



  • It has a statistics feature that tracks your performance and progress, such as your completion time, accuracy, and best score.



  • It has a daily challenge feature that offers you a new and unique puzzle every day, with different rewards and achievements.



  • It has a night mode feature that adjusts the brightness and contrast of the screen, to protect your eyes and save battery life.



The difficulty levels of Hard Sudoku APK




Hard Sudoku APK has six difficulty levels that cater to different types of players, from beginners to experts. Here are the difficulty levels of Hard Sudoku APK:



  • Fast: This level is for those who want to play sudoku quickly and casually. It has 25 clues and is easy to solve.



  • Easy: This level is for those who are new to sudoku or want to practice their skills. It has 20 clues and is moderately easy to solve.



  • Medium: This level is for those who are familiar with sudoku and want to challenge themselves. It has 15 clues and is moderately hard to solve.



  • Hard: This level is for those who are confident in their sudoku skills and want to test their limits. It has 10 clues and is hard to solve.



  • Expert: This level is for those who are sudoku masters and want to prove their prowess. It has 5 clues and is very hard to solve.



  • Giant: This level is for those who are sudoku fanatics and want to experience the ultimate sudoku challenge. It has 0 clues and is extremely hard to solve.



The advantages of Hard Sudoku APK




Hard Sudoku APK has some advantages that make this app worth downloading and playing. Here are some of the advantages of Hard Sudoku APK:



  • It is free to download and play, with no in-app purchases or ads.



  • It is compatible with most Android devices, with a minimum requirement of Android 4.4 or higher.



  • It is offline-friendly, meaning you can play sudoku without an internet connection.



  • It is updated regularly, with new puzzles and features added frequently.



How to download and install Hard Sudoku APK?




If you are interested in playing Hard Sudoku APK on your Android device, you need to download and install it first. Here are the steps to download and install Hard Sudoku APK:


The steps to download and install Hard Sudoku APK





  • Go to the official website of Easybrain, the developer of Hard Sudoku APK, at .



  • Scroll down to the section "Our Games" and find the icon of Hard Sudoku APK. Click on it.



  • You will be redirected to the Google Play Store page of Hard Sudoku APK. Click on the "Install" button.



  • Wait for the app to be downloaded and installed on your device. You may need to grant some permissions for the app to function properly.



  • Once the installation is complete, you can open the app and start playing sudoku.



The tips to solve hard sudoku puzzles




If you want to solve hard sudoku puzzles, you need to use some advanced techniques and strategies. Here are some tips to solve hard sudoku puzzles:



  • Use pencil marks or notes to keep track of the possible candidates for each cell. You can use the note feature in Hard Sudoku APK to do this easily.



  • Look for naked pairs, triples, or quads, which are groups of two, three, or four cells in a row, column, or subgrid that have only two, three, or four candidates respectively. You can eliminate these candidates from other cells in the same row, column, or subgrid.



  • Look for hidden pairs, triples, or quads, which are groups of two, three, or four candidates that appear only in two, three, or four cells in a row, column, or subgrid. You can eliminate other candidates from these cells.



  • Look for pointing pairs or triples, which are groups of two or three candidates that appear only in two or three cells in a subgrid and point to the same row or column. You can eliminate these candidates from other cells in that row or column.



  • Look for box-line reduction, which is when a candidate appears only in one row or column within a subgrid. You can eliminate this candidate from other cells in that row or column outside the subgrid.



  • Look for x-wing, Look for x-wing, which is when a candidate appears only in two cells in two different rows and columns, forming a rectangle. You can eliminate this candidate from other cells in those rows and columns.



  • Look for swordfish, which is an extension of x-wing, involving three cells in three different rows and columns. You can eliminate this candidate from other cells in those rows and columns.



  • Look for jellyfish, which is an extension of swordfish, involving four cells in four different rows and columns. You can eliminate this candidate from other cells in those rows and columns.



Look for unique rectangles, which are rectangles with two candi


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