Sudoku Snake 1.3

Sudoku, or Su Doku is a type of puzzle where a 9x9 grid of squares contains the numbers 1-9, one in each grid cell, where a number can not be repeated in any row, column or box (boxes are delineated by thicker lines). Every time you fill in a number Sudoku Snake will automatically check if your puzzle has a unique solution, what that solution is, and what the difficulty level of your puzzle is. In less than a minute you can have created your very own valid Sudoku puzzle. See who amongst your family and friends can create the hardest one!