R5C5 7 by scan for 7 in R6, C4, C6 on empty cells of central middle major square. R2C4 8 by scan for 8 in C4, C5 on empty cells of top middle major square. R1C1 6 by scan for 6 in R2, C2, C3 on empty cells of top left major square. R5C6 5 by scan for 5 in R4, R6, C4 - R2C5 5 by scan for 5 in C4, C6 - R9C9 5 by scan for 5 in R8, C7, C8 on empty cells of bottom right major square - R3C2 5 by scan for 5 in R1, R2, C3 on empty cells of top left major square - R7C1 5 by scan for 5 in R9, C2, C3 on empty cells of bottom left major square. Highlight color of valid cells in this first stage is banana leaf green.įirst few valid digits are all by row column scan, Otherwise we know that the single digit lock might become useful later and we ignore it for the present. If we get one, we should get usually a breakthrough in one step or two. In the process we may get valid cells, but otherwise our lookout is for identifying a single digit lock by cross scan. Strategy adopted: start with row column scan coupled with aggressive breakthroughs by advanced Sudoku techniques.Īs a strategy we always start row column scan from digit 1 and continue till digit 9. Solving very difficult Sudoku puzzles: Level 4 Game 13 Stage 1: Breakthrough by Single digit lock, Parallel digit scan, Double digit scan and Cycles of twins The very difficult Sudoku puzzle level 4 Game 13īefore going through the solution solve the puzzle first. Solution of this very difficult Sudoku puzzle will give you a good idea on the techniques and strategy of solving a very difficult Sudoku puzzle using your basic reasoning skills and pattern identification abilities. Solving very difficult Sudoku puzzles: Level 4 game 13 solved quickly by aggressive early breakthroughs using advanced Sudoku techniques. To print multiple puzzles, there are special pages to print two, four, or six puzzles per page.How to solve very difficult Sudoku puzzle level 4 game 13 quickly by advanced Sudoku techniques Guessing is never required - but it may help! Each puzzle has a unique solution and can be solved with pure logic. The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells.Įxtreme Sudoku posts five new puzzles every day. To save any position, right-click on under the grid, and click Add To Favorites or Bookmark This Link. You can add symbols too, such as question marks. If you prefer to enter your own pencilmarks, up to six digits can be entered in each cell. #SOLVING SUDOKU PUZZLES UPDATE#These update by themselves as you solve particular cells and cannot be edited manually. There are automatic pencilmarks that appear if you check the Pencilmarks box. So it's possible to have incorrect digits that don't conflict, but eventually you will get stuck. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. 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. See our guide to solution rules for hard sudoku puzzles.Īll the puzzles on this site rate a "fiendish" category, but then we picked the hardest, and graded them in five progressively more difficult categories: Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step. Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. Just place the digits from 1 to 9 in each empty cell. Then try some of our very hard sudoku puzzles.
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