If that’s all the information you have, you have little to do except guess. Consider a row that is missing digits 5 and 6.
#Color sudoku online free how to
Where sudoku puzzles get challenging is when there are multiple open positions in a row or column… In these cases you may need to look at more than one part of the puzzle to figure out how to solve the puzzle. This same strategy of finding missing digits easily extends to rows or squares. For example, if eight out of nine positions in a sudoku column already have a value, the nine position must contain the digit not already mentioned in the column. When there are many numbers supplied, it is easier to figure out which numbers can be put into a specific place in the puzzle.
Suduko puzzles typically get more challenging depending on how many numbers are supplied in the initial puzzle. These three constraints, that a digit not occur more than once in a row, column or square, make up the basic rules of sudoku. Additionally, you’ll notice the sudoku grid is divided into 9 squares, each 3x3, and a digit can also only occur within these squares. The numbers must meet certain criteria, specifically that the same digit cannot occur more than once in any column or more than once in any row. The grid starts out with some positions populated and your job is to fill in the remainder. Sudoku is a type of logic puzzle that requires you to fill in digits on a 9x9 grid.
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