What's Sudoku?

Sudoku, known as well as südoku or su doku is a logical kind of Japanese puzzle.

Rules are simple, it consists of a 9×9 grid, divided in 9 blocks of 3×3, that have to be filled up so all rows, columns and blocks (3×3) contain numbers 1 to 9 without repeating.

You obviously start out with some spaces already filled in. There’s only one possible solution for each sudoku, so be careful!

And Magic Sudoku?

Magic Sudoku is a variation of the original Sudoku. It's adds some new restrictions:

• Every main diagonal has the numbers 1 to 9 without repetition. (the same as original sudoku but applied to diagonals).
• Every Quadrant has only a number.
• There is some special rows (filled with blue color). The value of the numbers who are in this cells is lower or equal as the number of coloured cells in every quadrant.

This sudoku is more complicated, but... Want to try?.