Sudoku, a cross number puzzle
This is a part of Sudoku, cross "number" puzzle. This puzzle is becoming popular now in Japan.
The below photo is a whole Sudoku grid, consisted of 9x9 cells. Each cell must be filled with one digit number by the following rule: fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 to 9.
The digits to be entered are 1, 2, 3, 4, 5, 6, 7, 8 and 9.
Each row has 9 cells wide. A fill-in row must have one of each digit. That means that each digit appears only once in the row. There are 9 rows in the grid and the same applies to each of them.
Each column is the same as the rows.
The box, containing 9 cells in a 3x3 layout. A filled-in box must have one of each digit. That means that each digit appears only once in the box. There are 9 boxs in the grid and the same applies to each of them.
If you are interested in this puzzle, why not print out this and try this for a relax??