The traditional sudoku puzzle is a grid that measures nine squares across and nine squares down, so that there are nine rows and nine columns altogether. The grid is then further divided into nine 3×3 square boxes. The aim of the puzzle is to fill the squares with numbers 1-9 so that each number features in every row and column, and every box just once. There are some numbers included in the puzzle to get you started. The following steps can help you solve sudoku puzzles of ranging difficulty levels.
Enter The ‘Definite’ Numbers
If you are completing an easy puzzle, then there may be a row, column or box that has only one number missing. These numbers can be filled in immediately, and these may then lead to you discovering other definite numbers that can be added to the puzzle.
Pencil In Possibilities
When you have filled in the definite numbers, go through the puzzle again and pencil in all the possible numbers that could fit in one square. As you go through this process, other definite numbers will be uncovered and the pencilled in numbers can all be rubbed out and replaced with the definite number. Once these have been filled in then this process can be started again until the puzzle is complete.
Work Through The Puzzle Again
If you get stuck then go back to the beginning and work through the puzzle again. The chances are that you may have missed pencilling in a number and once this has been put right, you will be able to carry on with the pencilling in strategy and complete the puzzle.
Try More Difficult Puzzles
Once you have mastered the basics for solving sudoku puzzles, then these strategies will be able to be applied to puzzles of all difficulty ratings. If you have started off with solving easy puzzles, but now find that these are less challenging you could progress to more difficult puzzles. There may not be definite numbers to be found in more difficult puzzles, so you should start by pencilling in the possibilities.