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Sudoku Challenge

Description :
The aim of the puzzle is to enter a digit from 1 to 9 in each cell of a 9x9 grid made up of 3x3 sub grids, starting with various digits given in some cells. Each row, column, and subgrid must contain only one instance of each digit.

Instructions :   
1.Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 without repetition.
2. You will be given a random puzzle and there is one and only one solution.
3. The time you consume in solving puzzle will be your score(lowest is best).