This is a number puzzle. The aim of the game is fill all missing numbers. The sudoku board has 9 rows and 9 columns. Every row and every column must have each of the numbers 1 through 9 in any order. It means that you could not have any number twice in the same row or in the same column (duplicates).

The sudoku board is split in 9 grids. Each of them must have the numbers from 1 to 9 in any order.