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Sudoku Rule № 1: Use Numbers 1-9

Sudoku is played on a grid of 9 x 9 spaces. Within the rows and columns are 9 “squares” (made up of 3 x 3 spaces). 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.

SUDOKU RULES, Use Numbers 1-9

Sudoku Rule № 2: Don’t Repeat Any Numbers

As you can see, in the upper left square (circled in blue), this square already has 7 out of the 9 spaces filled in. The only numbers missing from the square are 5 and 6. By seeing which numbers are missing from each square, row, or column, we can use process of elimination and deductive reasoning to decide which numbers need to go in each blank space.

SUDOKU RULES, Don’t Repeat Any Numbers

Sudoku Rule № 3: Don’t Guess

Sudoku is a game of logic and reasoning, so you shouldn’t have to guess. If you don’t know what number to put in a certain space, keep scanning the other areas of the grid until you seen an opportunity to place a number.

Sudoku Rule № 4: Use Process of Elimination

What do we mean by using “process of elimination” to play Sudoku? Here is an example. In this Sudoku grid (shown below), the far left-hand vertical column (circled in Blue) is missing only a few numbers: 1, 5 and 6.


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