This is a classic example.Īt first glance, one might think that it isn’t possible to place a 7 in the top three regions. Sometimes you will encounter the situation where there is only one place a number can possibly go. The existing sevens prevent the number 7 from being in any other empty cells except for the ones circled in red. In the example at the left, I have identified the only possible positions for the number 7. Sudoku Hints For Slightly Harder Puzzles Look for the only possible choice. Repeat again and again until you can no longer find a solution for any cell. It is essential to learn this technique because every Sudoku puzzle requires its use.Īfter you have solved (if possible) for the number(s) that had the most “givens”, cycle through all the numbers 1 through 9, solving for each number as many as you can using the scanning method. Since we know that every row, column, and region can only have one instance of each number, you can logically use the scanning method I illustrated in my article “How To Play Sudoku” to find other cells that contain the same number. I like to start by first looking for a number that has the most “givens”. It is better to have a systematic approach to solving Sudoku. Most people I suspect just pick a spot at random to start. What is the missing number in the graphic at the left? Where do you start? The missing number is the solution for that empty cell. Is there a row, column, or region that has one cell unsolved? If there is you can quickly find the solution.Ĭount from 1 to 9 locating each number in that row, column, or region. Sudoku Hints For Beginners Look for the obvious. Let’s skip the guessing and learn to solve Sudoku by reason and logic. This breaks the Sudoku rules rendering an unsolvable puzzle. Usually, you will end up with two identical numbers in a row, column, or region. You may get half way through a puzzle before you realize that a mistake was made somewhere. Guessing will most often lead you down the wrong road.
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