![]() ![]() 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. To make it easier, trace a line over the column of the stem and another two over the rows of the branches. You can use your mouse, keyboard, or fingers (on mobile devices). No need to register or download anything. Each branch must share a candidate with the stem. Very Hard Sudoku - Very Hard Sudoku puzzles Welcome to the best Sudoku website in the world On our website, you will find an endless supply of Sudoku puzzles, from the easiest to the most difficult levels. Their shape roughly resembles a Y shape, with a cell that works as the stem and two branches. Join here Players with the same score are displayed in random order. The EBook contains 48 sudoku puzzles with solutions and will be sent by email. 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. website offers free service of generating PDF files with sudokus, that you can print. Easy Medium Hard Very Hard 81 cells to go Play and Win At the end of the month, 5 users with a score of 100 points or more will be randomly selected and win sudoku kingdom EBook. 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. 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. 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. ![]() In general, hard level sudoku puzzles have. These then branch out into other advanced techniques used mostly for the evil and impossible levels. Hard level sudoku is a type of sudoku puzzle that is considered more challenging than easy or medium level puzzles. The three most used in this level are called X-Wing, Swordfish, and XY-Wing. It can also be applied in some intermediate levels, although its incidence is very low in these cases. The X-Wing method is one of the most basic advanced Sudoku strategies. Look for rows, columns and 3×3 boxes with just a few blanks remaining. Regardless, their application always demands high levels of concentration from the player as they work by deduction. Some tips for solving Sudoku: Avoid trial and error find a logical reason for entering each number. Hard Sudoku Solving TechniquesĪdvanced techniques used in hard Sudoku levels are designed to eliminate candidates and help clear the grid. To complete the Sudoku puzzle, enter numbers into the spaces so that each row, column and 3×3 box contains the digits 1 to 9 without repeats. 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. As digits from 1 to 9 can’t repeat, you can eliminate a certain number if it already exists.Hard Sudoku Puzzles are designed for experienced players. It’s a key technique, which is based on scanning. You can’t solve Sudoku hard online free grid if you don’t use elimination. When you find one you can go for more and keep on going until you solve Sudoku online very hard.Įlimination in Sudoku Free Online Hard. Such a square of free Sudoku hard level grid might have only 1 possible number, aka a single candidate. A technique that requires examination of the surrounding columns, rows, and 3x3 boxes for 1 empty square. Single Candidates in Sudoku Online Hard Free. ![]() And all you need to do is to scan a row, a column, or a 3-box area in one or two directions. The technique is very intuitive and effective. Scanning is constantly used in Sudoku game hard and all other levels. This is probably the easiest and most common technique. Let’s see the most common web Sudoku hard techniques that are must-know to play free web Sudoku hard level puzzles. Not all users can jump into very hard Sudoku online right away, as this level of the game requires experience and certain skills. ![]()
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