Sudoku Hard - Free Online Game

Instructions:

• Enter the numbers from 1 to 9 in the empty fields of the Sudoku board so that each number appears only once per column, per row and per block (3×3 subsquare)!
• Memorize which numbers are possible for a field by pressing Notes and noting possible numbers for later.
• Click on a field and click on the trash can icon to delete the entered number.
• Use the Check function to display incorrectly entered numbers. As soon as all fields of the Sudoku puzzle contain the correct number, you have won the game and can enter your name in the High Score list.