How to Play. Fill the grid with your keyboard so that every row, column and 3×3 box contains the digits 1 to 9, without repeating. Navigate the grid with the arrow. Extreme Sudoku - Very Difficult Sudoku Puzzles and Solver. Two Sudoku Puzzles Printed · Four Sudoku Puzzles Printed · Sudoku Printables. Play unlimited Sudoku online from Easy to Evil. Compatible with all browsers, iPad and Android. Provider of Sudoku puzzles for newspapers and other. Answers are not nearly as evident in this Hard Sudoku board only recommended for seasoned Sudoku players! Hard sudoku is played just like all easier sudoku boards before it - place the digits one to nine into all the columns, rows, and 3x3 boxes on the sudoku board only once. Valentines Day Sudoku St. Disabling this mode will clear all the candidates, so this can be toggled on and off for a quick at-a-glance candidate survey. If you enable Automatic mode the Auto button , candidates will be toggled automatically as you fill the grid. Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. To print the puzzles use either the Print button below the grid, or if you want to print the pencilmarks as well, use the browser Print option under the File menu. You can also toggle candidates with your mouse, and pressing Space will switch between Fill and Candidate Mode. Disabling this mode will clear all the candidates, so this can be toggled on and off for a quick at-a-glance candidate survey. Once a number is in the grid nine times, it will lighten. Valentines Day Sudoku St. Topics Life and style Sudoku. You may need to employ more advanced techniques of pattern finding in order to whittle away at the possibilities of numbers each block on the sudoku game board can hold. Calls from other networks may vary and mobiles will be considerably higher. Extreme Sudoku posts five new puzzles every day. Sudoku Sudoku Hard. Guessing is never required - but it may help! Calls from other networks may vary and mobiles will be considerably higher. The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells. There are automatic pencilmarks that appear if you check the Pencilmarks box.