Hard Sudoku - (Thursday, May 20, 2010)

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Timer 00:00 May 20 Easy Sudoku Very Easy Sudoku Medium Sudoku Very Hard Sudoku

You play the Hard level sudoku puzzle of thursday, may 20, 2010. If you want to play the other sudoku puzzles of the same day, you can click difficulty names on the right hand side of the sudoku table.

How to play :

• To fill a cell with a number just click on the cell and select a number in the opening dialog.
• To reveal any mistake just click the "Check" button.
• To restart the puzzle click the "Start Over" button.