Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes contains the digits from 1 to 9 only one time each.
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To play, Javascript of your web browser must be activated and you need Flash player which must be installed or upgraded on your computer. You can download this free player on the Plugins page.