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Each Sudoku has a unique solution that can be reached logically without guessing. Enter digits from 1 to 9 into the blank spaces. Every row must contain one of each digit. So must every column, as must every 3×3 square.
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Use your mouse or keyboard.
Use the Ctrl key to write notes inside a square.
Use the Options to set the New Game Level (‘Blank’, Easy, Medium, Hard, Evil).
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