Try to solve Sudoku Puzzle. Timer will start when first move is made.

Sudoku is a puzzle based on a small number of very simple rules:

- Every square has to contain a single number

- Only the numbers from 1 through to 9 can be used

- Each 3by3 box can only contain each number from 1 to 9 once

- Each vertical column can only contain each number from 1 to 9 once

- Each horizontal row can only contain each number from 1 to 9 once

- The puzzle is solved when every square is filled with no duplicates in any 3by3 box, row or column