Sudoku - Classic Sudoku Puzzle

Experience the ultimate Sudoku challenge for both beginners and experts! Embark on a thrilling journey with thousands of puzzles to solve. Get ready to tackle daily challenges by downloading the Sudoku - Brain teaser, number puzzle game today!

Indulge in the world of cool math games with a variety of Sudoku puzzles at your fingertips, featuring Easy, Medium, Difficult, and Expert levels. Download Sudoku now and select the level that suits your skills!

Have fun unraveling easy puzzles or boost your logical thinking with medium to hard levels. Utilize the memo feature to jot down notes during gameplay, and fear not making mistakes as there are undo and hint options available! Stay resilient and never give up!

What is Sudoku?

Sudoku is a number-placement puzzle widely popular around the world, credited with helping to keep the brain active and healthy.

The basis of the game originated in Switzerland in the 18th century when the mathematician Leonhard Euler developed the concept of Latin Squares used in statistical analysis. The modern Sudoku as we know it today, however, using digits instead of the Latin alphabet, was most likely the creation of Howard Garns, an architect from Indiana who first published his version of the game in the Dell Magazines in 1979.

Its widespread popularity didn’t come until the game reached Japan in 1984 when Nikoli published it under the name “Suuji wa dokushin ni kaguru” (The numbers must remain single) in the Monthly Nikolist Magazine. Nikoli also introduced two new rules that became essential to the game as we know it today. The first was the concept of symmetry.

The given numbers at the beginning must create a pattern in their allocated squares to make the game more visually appealing to the players. The second and most important rule is that no more than 32 numbers out of the 81 can be given away, as the goal becomes too easy to reach above this threshold. As the game’s popularity increased in Japan, its designation was eventually shortened to include only the characters for number (数 - Su) and single (独 - Doku), resulting in the name by which we now know it, Sudoku.

Nikoli’s sudoku version later spread throughout the world thanks to Wayne Gould, a retired Hong Kong judge who first encountered the game in a Tokyo bookstore and later published a book with his own puzzles in the UK and the US. Later, newspapers all over the world started including these games in their publications.

Sudoku Tips 

Naked singles

Write down every possibility for each cell. If when you cross the rows and columns you find a blank space with only one possibility, you have found a naked single and the right answer for that cell. 

Hidden singles

Hidden singles are, in fact, naked singles that occur once you add a new digit to a row or a column. Keep your pencil notes updated and check them often throughout the game to find these. 

Naked pairs

These occur when you have two identical pairs of candidates in a single row or column. Even if you do not know their right placement, you can identify without a doubt their position in the grid. Thus, you can eliminate those digits from any other possibilities in that row or column. 

Hidden Pairs

Hidden pairs are cells with two identical candidates positioned in opposite corners of one square and nowhere else in the region. This means that you can be certain that those two blank spaces can only be filled with one or the other.

They are called hidden pairs because there might be other candidates for the same cells, which can make them hard to spot. 

Naked Triples

Naked triples occur in rows or columns when you have three candidates that overlap. The digits do not need to be the same for every cell, but this will tell you that those digits will be, for certain, in that row or column, allowing you to eliminate other possibilities.

If you have the combination of 6/8 – 8/4 – 6/4 in the same row, you know that these 3 digits will be in that row regardless of their right placement. You can then eliminate these numbers from your pencil notes on the remaining rows of their square.

Unlocking possibilities

The grid in Sudoku is always changing. Every time you place a digit, several possibilities open on other blank spaces. Check the ones immediately affected by the filled cell, and you might find their answer right away. Pay attention to the neighboring squares also, as their structure is very likely to have changed too.

Don’t try to guess

Sudoku is a simple game of logic. Guessing should be your very last resort as it can easily throw off the puzzle and make it unsolvable.

Keep your grid clean

Review and update your pencil notes often to avoid cluttering the grid with possibilities. The more candidates you note down, the noisier the puzzle will become, which not only makes it more stressful, but also can prevent you from finding easy numbers like naked singles.

Practice makes perfect

Your skills will improve after each Sudoku challenge. With time, the brain becomes faster and better at finding the weakest spots, possible candidates, and crossing all the information of rows and columns at once to find the solution. This increased performance also extends to memory, and pencil notes become less important.

A beginner challenge that once looked anything but easy can turn ridiculously quick to solve after just a few puzzles.

Sudoku is such a simple and yet popular game precisely because it is a battle against oneself and you can experience the results of your training firsthand.

Exciting Features:

1.Engage note mode for a traditional puzzle-solving experience

2.Identify errors and push your limits with real-time error checking

3.Conquer daily challenges to earn special trophies

4.Seek free hints when you hit a roadblock

5.Effortlessly lock numbers for multiple cells with number-first input

6.Embrace the Dark Theme for soothing bedtime play

Additional Functions:

1.Keep track of game statistics for each difficulty level

2.Enjoy unlimited undo options to rectify mistakes quickly

3.Benefit from autosave so your progress is always preserved

4.Make good use of the eraser to obliterate errors

5.Play without restrictions by adjusting the mistakes limit in settings

Notable Highlights:

1.Navigate the 9x9 grid featuring a simple design

2.Experience well-balanced difficulty levels：Easy, Medium, Hard, and Expert。

Challenge and entertain your mind with the Sudoku - Brain teaser, number puzzle game anytime, anywhere. If you're a Sudoku enthusiast looking for a mental workout, delve into this game and test your problem-solving speed!

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