Sudoku originally called Number Place is a logic-based combinatorial number-placement puzzle.

In classic sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.

Completed games are always an example of a Latin square, including an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same row, column, or any of the nine 3×3 subregions of the 9×9 playing board.

Chess sudoku includes king sudoku and knight sudoku has arrived. Rules is simple:
Knight Sudoku: Normal sudoku rules apply, as well as the 'anti-knight' rule, in which no two squares that are a knight's move apart can have the same digit.
King Sudoku: The rules are similar to normal Sudoku: Place a digit from 1-9 into each row, column and 3x3 box only once. No pair of diagonally adjacent cells may contain the same digit

Playing Sudoku daily with our game, and we hope to see you soon in the Friend Challenge mode. Stay tuned and happy brain training.

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