is partially solved using easy and medium difficulty solving techniques: singles, hidden singles and column/block intersections. While solving sudoku, your brain exercises logic, learns to make decisions, and puts your memory to the test.

the relevant pencil marks are entered to show that you have two possible squares in which the 3 can be placed in the third and fourth columns, and three possible squares in the seventh column (highlighted). The correction function is also very useful, since due to the high level of complexity, it is necessary to make corrections more often. Pencil marks are small numbers, usually written at the top of each unsolved square, listing all the possible values for that square. InNovember 2006, The Times introduced a new extreme level of Sudoku giving players a moredifficult level of logic: Super Fiendish. Any cell that intersects both pincers can’t longer contain a candidate for digit Z, because the pivot means either of the pincers to contain this digit.Well, you have established that the 7 for the first column must be in one of the two highlighted rows; not in any other squares in this column. Let’s say, there are 3 different cells with exactly 2 candidates (notes) each that are related to each other.

You will soon become an expert in Sudoku practicing regular and you can easily and quickly cope even with the hardest Sudoku.Simple logic and basic knowledge of sudoku rules won’t cut it – you as a player should know advanced sudoku solving techniques and understand how to apply them in practice. 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. Play 1 or 2 evil sudoku games every day and you will not have any problems with losing focus while doing important things. If you really like Super Fiendish, you will have to wait a little longer for The Times Sudoku 7 with 25 extremely hard Sudoku, many requiring x-wing or swordfish to complete.

Sudoku is one of the world’s most popular puzzle games, but even though it’s a game played by millions of people all over the world, there is a big difference in skill level between the most successful Sudoku players and average Sudoku players who enjoy the game just as a casual hobby. With many advanced techniques, the key is to spot patterns within your pencil marks to eliminate possibilities within other squares.Whenever you solve a square, you must remove that number from the pencil marks in all other squares in the same row, column and block.

Regular game practice will teach you to pick up mental thinking models from sudoku and use them in real life while analyzing different situations. A swordfish is found when for three rows, there are two or three possible squares in which a particular number can be placed, and for all three rows these squares lie in the same three columns. Visit our site to see the great iPhone application that brings you Sudoku, Killer, Jigsaw, Kakuro and Mini Sudoku to your iPhone/iPod Touch.

The best way to solve the evil sudoku puzzle is to start with the blocks where there are more prearranged numbers. Press N to switch to note-taking mode, or press Shift-1 through Shift-9 to set notes without switching modes. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. In the diagram there are complete pencil marks for all squares in rows three and seven, and a necessary column/block intersection to eliminate a 7 pencil mark. Using the same logic in the last column, you can also eliminate the 7 as a possibility from all squares which are not in either highlighted row (Fig.