Continue using logic and deduction until you have filled in all of the empty squares. 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. Click on the pen button, then left-click on a square and drag the cursor up and down to enter your 'pen. Enter the correct number in every grid square to win Sudoku has two modes: Pen and Pencil. Each number can only be used once in a given row or column. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Use simple logic to fill in the puzzle's nine rows and nine columns with numerals 1-9. Then look for single empty squares in each row and column that you can fill in. 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.
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. The grid is divided into 9 separate 3 x 3 squares.
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.
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