Free Online Sudoku

Understranding the Layout

The game of Sudoku contains a grid of 81 squares. The grid is divided into nine blocks, each containing nine squares. The rules of the game are simple: each of the nine blocks has to contain all the numbers 1-9 within its squares. Each number can only appear once in a row, column, or box.

Filling the Grid

Fill the rest of the grid respecting the conditions. Numbers 1-9 must be used without repetition in each row, each column, and each 3x3 box.


You have successfully completed the Sudoku puzzle when each row, column, and 3x3 square contains all of the digits from 1 to 9 with no repeats


Remember, Sudoku is a game of logic and reasoning. There should never be a need to guess. If you’re not sure what number goes in a certain spot, you should keep looking and scanning until you find the proper location for that number. Guessing can lead to errors later on, which might be difficult to fix.

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