![]() ![]() Looking at box 1 and box 3 we can see there are already 9s in row 2 and in row 3, which excludes the two bottom rows of box 2 from having 9. Scanning in one direction: In our first example we will focus on box 2, which like any other box in Sudoku must contain 9. Continue using logic and deduction until you have filled in all of the empty squares. Here are some ways of using scanning techniques: 1. ![]() Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. At the heart of the technique is to take groups of three rows and columns in turn, working methodically through the whole grid. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Then look for single empty squares in each row and column that you can fill in. This is a simple example of how you can use a more advanced Sudoku solving mindset to approach the Sudoku grid with focus and a repeatable method: look for pairs of numbers within the same set of squared. If you see a single empty space in a larger square, fill that in first. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. In the example above, the cell circled in red can be solved quickly by looking for the missing number. Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square. Within the rows and columns are 9 squares (made up of 3 x 3 spaces). To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. In my article How To Play Sudoku, I touched upon the Sudoku strategy to look for a cell in every row, column, and region that can be solved by looking for the only possible choice. How to Play Sudoku Sudoku Rule 1: Use Numbers 1-9 Sudoku is played on a grid of 9 x 9 spaces. The grid is divided into 9 separate 3 x 3 squares. Every game consists of 3×3 blocks, which in turn are divided into 3×3 boxes. Sudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. Play Sudoku online Every day new and printable Sudoku Rules. ![]()
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