If one number is true, the other becomes impossible. By mentally connecting the two diagonal ends of this link, the user can determine that only two pairs of numbers can be excluded from this link. You can apply the X-Wing strategy when you realize that the same candidate is located in four different grid cells joined by a row and a column and forming a square or rectangle when you draw an imaginary line between them. They also apply to other more advanced and impossible levels. The three most commonly used methods at this level are called X-Wing, Swordfish and XY-Wing. You can also use different symbols to indicate solution options.Īdvanced methods used in hard Sudoku are designed to eliminate candidates, help clear the playing field, and calculate the most likely location of a particular digit. They can mark the numbers that were used. When solving them, you can use different colors. Some strategies for solving hard web Sudoku On this site, you can play difficult Sudoku online, without registration, but by registering you can participate in the ratings and compete for first place with other service members. The following basic rule should be taken into account: each of the participating digits should not be repeated in any 1x9 row, 1x9 column or 9x9 sector. The goal is to fill in the missing digits (only 1, 2, 3, 4, 5, 6, 7, 8, 9) in the empty cells of the game board, the dimension of which is nine by nine cells. To quickly achieve a successful final result, the user must actively engage their logical thinking, wit and patience. In this case, the "pencil" notes function is not a tool to solve hard level Sudoku puzzles, but only acts as an auxiliary element of the interface (for more details about the interface, see the web Sudoku).
Having played the previous medium level, any player can increase the difficulty and go to this difficult Sudoku, which has an even smaller set of numbers filling the cells on the playing field.
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