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Games - Sudoku
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Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution. The number of essentially different solutions was shown by Ed Russell and Frazer Jarvis to be just 5,472,730,538.
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Tips: 1. Double-click a cell to mark it in green as confirmed (i.e., you enter a number you're sure about). Double-click it again to cancel; 2. Color marking option: check "Mark Red" or "Mark Cyan" then click a cell, the cell will be marked in Red or Cyan. To clear the color, uncheck the checkbox, and then click the cell again.
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中文
