Sudoku rules are simple, but playing requires deep attention and logical reasoning skills.
The game board is made up of nine columns and nine rows, subdivided into nine 3x3 sub-sections, for a total of 81 squares.
The goal is to make sure each row and column contains only the numbers 1-9 with no duplicates or omissions.
Fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contain all of the digits from 1 to 9. The grids can also be called as Boxes, Blocks and Regions.
Each game board starts out with some cells already filled in. Usually, easier puzzles start with more numbers filled in; harder puzzles start with fewer numbers.
Below we're trying to solve the number in the grey coloured cell which is on the middle grid.
Its 3x3 block or gridwith numbers 2,3,5,7,8,9 which has three empty cells, and the numbers missing here are1,4,6. So, we know the grey cell must contain one of these numbers, and no others.
1 or 4 or 6 ?
A little observation shows that the row above and below already contain the number 1.
Therefore, the grey cell must contain the number 1. The numbers 4 and 6 must go in the two remaining cells.
Now, 4 or 6?
A little observation shows that first column of the grid has 4 available already. So, this cannot be repeated on the same column of the cell and the only available option left is the bottom cell.
Now the grid looks easy with only one empty grey cell. And the only option is 6.
Seems interesting, isn’t it?
Scenario 1: Placement of number 5 is wrong here as the number is repeated in the same grid.
