Sudoku's name combines two Japanese words: "数" (sū), meaning "number," and "独" (doku), meaning "single" or "only." The game became widely popular in Japan, and its name was later adopted in English-speaking countries. sudoku extremely hard Naked Quadruples: Identify four cells with four possible numbers, and eliminate those numbers from the other cells in the same row, column, or subgrid. sudoku like games
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