![]() ![]() the length of a 1-3-6 series is 3.)įirst seen odd/even Sudoku: If odd, the first odd number in the corresponding direction or, if even, the first even number. MaxAscending Sudoku: The length of the longest series of ascending digits in the corresponding direction. Higher skyscrapers block the view of lower ones, size being given by the digit. Skyscraper Sudoku: The number of visible skyscrapers from that side. Next-to-6 Sum Sudoku: The sum of all direct neighbours of the digit 6 in the row or column. Outside-2 Sudoku: Must be placed in one of the first two cells in the corresponding direction. Outside clues per variant show:ĭifference Sudoku: The difference of the first two digits in the corresponding direction. Normal 6圆 sudoku rules apply to all sudokus, so each row, column and region must contain 1-6. A circle is an outside clue for both adjacent puzzles. If you want to practice your concentration and logical thinking skills and youre a fan of some sophisticated strategies, expert Killer Sudoku is the right match for you. It’s tremendously hard to solve, but it feels as much as rewarding when you’re done with it. This is one large puzzle, consisting of six different variants of 6圆 sudokus, all linked together by circles. Expert Killer Sudoku is probably one the hardest number puzzles out there. May not work on non sudoku grids or special constraints. If the cell where the lines meet one another contains the digit shared by the stem and the branch, you can safely eliminate it from being a candidate to it.Hotkeys Selection Select cells + Mouse click/drag Add or remove from current selection Move selection +, + Add to current selection + Select all cells + + Deselect all cells + Invert selection, Tool sensitive selection Number Entry Insert value, pencil mark, candidate or colour Insert value, pencil mark, candidate or colour Button Insert value, pencil mark, candidate or colour Change Tool, Next mode +, Previous mode "Digit" mode ( on German keyboard layout) "Corner" mode "Centre" mode "Colour" mode + Enter digit in "centre" mode + Enter digit in "corner" mode + + Enter digit in "colour" mode Undo / Redo + Undo last action + Redo last action if it was undo Check finished puzzle Button Press the check button to test basic sudoku rules. To make it easier, trace a line over the column of the stem and another two over the rows of the branches. Each branch must share a candidate with the stem. Their shape roughly resembles a Y shape, with a cell that works as the stem and two branches. The XY-Wing is applied when you find three cells, each with only a pair of candidates, that share at least a digit between them (e.g. Like with the X-Wing technique, you should then test both of them and eliminate that candidate from cells that become impossible when both sets are applied. When united, these blocks create a closed chain that reveals only two possible sets out their combination. The position of the cells does not need to be symmetrical, but each must be connected to at least another by column. Hard sudoku and evil web sudoku levels are very difficult sudokus that require skills and experience and are great for practicing concentration and patience. With the Swordfish technique, you must have three rows that contain two cells each with the same candidate. The goal is to test these sets and eliminate that candidate from any cells in the grid that would become impossible under both. Perfect for stimulating the mind and improving reasoning skills, this book comes complete with 200 random easy to very hard difficulty level sudoku puzzles. If one is true, then the other becomes impossible. By mentally connecting the two diagonal extremities of this, you can determine that only two pairs of possibilities can come out of this link. ![]() ![]() You can apply the X-Wing strategy when you find the same candidate in four different cells within the grid, united by row and column, and forming a square or rectangle when tracing an imaginary line between them. These then branch out into other advanced techniques used mostly for the evil and impossible levels. The three most used in this level are called X-Wing, Swordfish, and XY-Wing. Hard Sudoku Solving TechniquesĪdvanced techniques used in hard Sudoku levels are designed to eliminate candidates and help clear the grid. Advanced techniques will also be required to eliminate candidates and find the solution for each cell. In this difficulty level, the number of allocated clues at the start of the game is considerably reduced and finding the solution for the remaining cells requires high doses of concentration and logic.Īt this point, pencil notes are no longer an option but rather a necessity to be able to work through the grid. Hard Sudoku Puzzles are designed for experienced players. To solve the most hardest Sudoku puzzles (online on this website and without having to register), you will need to employ all the strategies you have. ![]()
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