This is a classic game of Sudoku. Your friends have challenged you to play your favourite game and you have to use your powers of logic to solve this puzzle.
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Choose the difficulty level of the game; look at the numbers 1-9 which are underneath the grid. Click on one of these and then again on a box in the grid to fill it. Fill in the whole grid so that each of the nine boxes, each row and each column contains the numbers 1-9 only once. If you make a mistake, click on the number which you want to change. Numbers will appear red if they are repeated in a row, column or box.