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SUDOKU - Fun puzzle game! Play more games on the left-bar menu INTRODUCING: 游戏的目的是用一系列单位数字填充Sudoku网格，每个数字仅在给定的行，列或3×3块中出现一次。
At the start, there are a number of pre-populated cells in the grid that act as clues to help the player gradually solve the whole puzzle. By definition, a valid grid must have one (and only one) solution. We make sure that all our grids have a unique solution. While it is easier to design a grid with multiple solutions (or no solutions at all), that cannot be considered a real puzzle. As in the case of many logic games, there can be only one answer. Therefore, great care should be taken when designing as even a misplaced number will render the puzzle unsolvable. CHECK IF THE NUMBER APPEARS OR NOT If a number appears, determine which other squares in the same row or column cannot accept the number; 如果没有出现数字，请确定哪些其他正方形无法接受该数字，而在同一行和列中其他块中的相同数字发生不同。
当行，列或块中只有一个可能的值时，这就是数字进入的地方。
有了一点体验，您应该能够可视化数字可能出现的正方形，就像在网格上“点亮”数字一样。
This will allow you to detect more advanced configurations.