Sudoku Village

How good are you in sudoku? As you may, or may not know, in this game you have a 9x9 grid with some numbers already filled in. To solve the puzzle, fill in the empty square with any number from 1- 9. The puzzle is complete when each row, each column and each 3x3 square within the puzzle contains the numbers 1-9, with each number appearing only once. There are three levels of difficulty, with (practically) unlimited number of possible combinations.