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Sudoku

Simple but complex at the same time

By Sarah DanaherPublished about 15 hours ago 5 min read
Sudoku
Photo by Mohamed Marey on Unsplash

The form of entertainment called puzzles is both complex and remarkably simple. They retain their appeal and relevance from history to the present day. They come in a wide range of formats and types, from traditional jigsaw puzzles to various logic games available across books and electronic media. Throughout all of history, puzzles have engaged individuals across generations and endured from early societies to the modern era. Among these, Sudoku has been one of my personal favorites since childhood. Although some may find Sudoku intimidating, I am drawn to the logical process of ruling out possibilities. The simple rules focus on the puzzle's logical nature. Once they are discovered, the primary goal is to resist the wanting to keep solving. The goal of the game of Sudoku is to find a single correct answer through logical deduction. This puzzle’s lasting allure stems from its ability to combine a simple design with complex logical reasoning. Thus, this guide will analyze how Sudoku’s structure and logic exemplify the challenging appeal and cognitive benefits of puzzles, both as timeless entertainment and as tools for developing logical reasoning. The rows, columns, and squares create a game of deduced answers in the grid to achieve final conquest.

By Bozhin Karaivanov on Unsplash

First, one must clear one’s mind and look for the elimination factors. The rules state that the numbers 1 through 9 in the basic game can appear only once in each row, column, and square. There are ones with fewer and more numbers, but for this example, I will be focusing on the nine-by-nine basic puzzle. There is also the letter version, which is also fun after one understands the basic concepts. The main books will give you the easiest to start and the end to truly challenge your logical thinking.

Rows run horizontally across the puzzle, while columns run vertically. In a standard Sudoku puzzle, the grid is a large square consisting of smaller squares. For example, in the classic 9x9 Sudoku, the large square is divided into 9 smaller 3x3 squares. These smaller squares are arranged in a 3x3 pattern to form the large square. While puzzles can come in different sizes, from as small as 3x3 to as large as 12x12, this guide will focus on the classic 9x9 format, which is the most commonly used. The same guiding principles apply to other types.

Solving a Sudoku puzzle can be challenging. It is essential to identify the possible numbers for each individual space by carefully reducing the numbers already present in the consequent row, column, and square. When a number can appear once within a set row, column, or square, that becomes the only possible answer for that particular space. Otherwise, the available options for each cell are written down until further eliminations reveal the correct value. This method comprises carefully analyzing these three interacting areas to logically determine each answer in each space. The time required for this strategy can be given for individual skill levels and the specific difficulty of the game. Puzzles with more given numbers are easier to solve. Those with fewer given numbers will become more challenging because there are more possibilities. Guessing is not recommended, as one mistake leads to more mistakes. Relying on careful deduction increases the likelihood of correct answers. Looking for certainty that a number belongs in a particular location is essential for finishing the puzzle in the best time.

Often, a puzzle will contain a combination of straightforward answers and multiple possibilities. Occasionally, incorrect numbers may be entered and must be corrected. The approach to finding the correct numbers varies from person to person. Some solvers focus on identifying obvious answers from immediate deduction, while others prefer to list all possible options for each space, then eliminate options as answers are placed in each area. Both methods are valid, and individuals should use the strategy that best suits them.

A technique I call 'ghost numbers' to help eliminate additional possibilities. In this method, if a number can appear only in specific cells within a row or column of a particular small squares, even if those cells are not yet determined, that number cannot appear in the corresponding cells of the same row or column in other subgrids. By noting these particular placements, one can logically eliminate that number as an option elsewhere, except for the small square. Careful examination of each row, column, and subgrid using this method further narrows the possibilities.

The worst is when one just guesses instead of confirming the only number it could be. This will set anyone back, even to the point of restarting the puzzle. The most important thing is to carefully list the possible options. This will then give an indication of what should be picked.

Once one understands the concept, it becomes easy. First, one must look for the obvious answers. This one is the first. The number of clues given will dictate. Technically, there are only nine possibilities for any space. First, I prefer to narrow down to the easier answers and fill them in first to increase the number of elimination factors. Then the possibilities are written down on the available space without including what is already in the row, column, or square. Once an answer is discovered, it will eliminate that number in the corresponding row, column, and square. Then relooking at the possibilities to find the next number that it could only be. Once the numbers are placed, the possibilities start to decrease. This will make the answers come faster. Once all the answers are filled in, a simple cross-check against the answer guide will verify the win. It really is a simple puzzle at the end.

Continually evaluating each row, column, and subgrid is essential to narrowing down the final answers. Each part is both independent and interconnected, as the numbers 1 through 9 will appear exactly once in each space. When a number is placed in one area, it is eliminated as a possibility in the corresponding row, column, and square. As correct answers are found, the puzzle will fill. Easier puzzles provide more given numbers, allowing faster completion. More challenging puzzles offer fewer given numbers, which increases the number of possible answers for each space. The more answers one has, the more likely one is to finish. The final step is to verify the completed puzzle against the provided solution. Occasional errors may occur, but regular practice improves accuracy.

As one improves, the answers will come more easily and be seen as simple logic puzzles rather than overwhelming enigmas. This engaging puzzle, enjoyed by many, comes in various forms, yet the basic rules remain the same across variations. One’s mind can stay sharp through time. This helps reduce the number of guesses and encourages deduction to provide accurate answers. This gives a better understanding of logical reasoning through practise. The availability of both print and electronic sources makes Sudoku widely accessible worldwide. In the end, the allure of Sudoku lies in its combination of simplicity and challenge, its benefit for developing reasoning skills. It is also a number game that can be understood across cultures. The rules provide standard play and easy understanding. The quest for answers through deduction may be difficult at first, but it often brings satisfaction once mastered. Sudoku offers cognitive and recreational benefits and has maintained its popularity. The simple game of deduction using rows, columns, and squares ultimately provides the mental stimulation and enjoyment while developing valuable logical reasoning abilities that can be used in other aspects of life.

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About the Creator

Sarah Danaher

I enjoy writing for fun. I like to write for several genres including fantasy, poetry, and dystopian, but I am open to trying other genres too. It has been a source of stress relief from my busy life.

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  • Rick Henry Christopher about 11 hours ago

    This is great Sarah. I love Sudoko but it’s been a long time since I’ve done it. Thank you for writing this - I am going try my hand at it again.

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