http://sudoku.koalog.com
About Sudokus
A single rule
each line, column and 3x3 square must contain all numbers from 1 to 9
How to play
A first method consists in counting, for each of the 9 values, in each of the 27 zones (lines, columns and squares), the number of possible cells. A second method consists in counting the number of possible values in each of the 81 cells. Of course, you will have to come up with more complex methods in order to solve the hardest Sudokus.
Try our
easy
Sudoku of the day
Mode
errors in red
no indication
Level
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easy
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hard
very hard
expert
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