# Unraveling the Logic Behind Solving Sudoku

Written by Eric · 1 min read

Are you a fan of Sudoku puzzles but find yourself getting stuck frequently? You’re not alone; Sudoku has enthralled puzzle enthusiasts worldwide since its invention in 1979 and has gained immense popularity. Here, we’ll uncover the mystery behind the logic that can help you easily solve any Sudoku puzzle. Pay close attention as we reveal hidden gems you might not have discovered.

The beauty of Sudoku puzzles lies in their simplicity, with a 9×9 grid broken into smaller 3×3 squares. The challenge begins by filling each row, column, and 3×3 box with numbers from 1 to 9 without repeating any digit. Sounds easy. There is a catch, though Sudoku puzzles come with givens, predetermined numbers placed within the grid. Every Sudoku solver must begin by working with the given numbers. These digits act as your guiding stars, setting the tone for the rest of the puzzle. A quick grid scan with these numbers in mind will reveal the possibilities for placing other digits.

## Use the process of elimination

One of the essential techniques for solving Sudoku puzzles is the process of elimination. It’s simple: if a number already exists in a row, column, or 3×3 box, it cannot be repeated in that same region. Consider the given numbers in the puzzle and look for opportunities to narrow down the placement of other digits. With each elimination, you better understand where the remaining numbers should go.

## Look for naked singles

‘Naked singles’ is a Sudoku term referring to grid cells that can only accommodate a single digit. To identify these, analyze each empty cell and figure out what numbers cannot be used there due to their existence elsewhere in the row, column, or 3×3 box. If you scrape away enough possibilities, you might be left with just one option: the naked single. Place the correct digit in that cell and move on to the next one.

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## Apply the “Hidden Singles” strategy

The seemingly elusive ‘Hidden Singles’ technique can be Sudoku’s secret weapon. It involves seeking single-digit possibilities hidden within a row, column, or 3×3 box. These hidden singles can be identified by scanning rows, columns, and boxes in combination. Look for instances where certain numbers appear in only one specific cell, even though the same number might be placed elsewhere in the same row or column. If you spot such an opportunity, congrats, you’ve just found a hidden single. This technique can be a game-changer when confronted with a particularly challenging Sudoku puzzle.

## Use subsets and pattern recognition

For harder Sudoku puzzles, you’ll need to up your strategy game. One technique for advanced Sudoku players involves identifying subsets, where you can restrict the placement of a certain number to a group of specific cells. Sometimes, there might be a box with only two possible placements for a certain number. In these cases, discover a pattern in the group or leverage specific characteristics of the subset to make educated guesses about which cells are most likely to house the correct number.

## Wrapping up

Sudoku is a game of wits, patience, and strategy. As you continue to practice and master the logic behind this captivating puzzle, you’ll find yourself tackling harder grids with more confidence and skill. Embrace the challenge and enjoy the satisfaction of cracking the Sudoku code.

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