The one rule of Sudoku:
Fill in all blank cells making sure that each row, column and region contains each of the numbers 1 to 9.
A Sudoku, alternate regions shaded
A typical Sudoku is a 9 x 9 grid of cells. Some cells will contain a number between 1 and 9. These are the ‘clues‘ or ‘givens‘.
Your task is to fill in the remaining cells, by putting a number in between 1 and 9 in each cell.
But each number can only appear once in each row and column in the grid.
And, to make things more interesting, the grid is divided into 9 ‘subgrids‘ or ‘blocks‘ or ‘boxes‘ or ‘regions‘ each of which is a 3 x 3 grid. And each number can only appear once in each region.
There is no maths involved in solving the Sudoku – a Sudoku puzzle could be played with nine different images or symbols, instead of numbers. It takes pure logic to solve a Sudoku puzzle, and there is only one correct solution for each Sudoku.
A Sudoku, alternate regions shaded
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