Windoku
Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.Each of the four...
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Rules summary
Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. Each of the four shaded 3x3 boxes contains each digit from 1 to 9.
Full rules
FAQ
How is Windoku different from classic Sudoku?
It keeps the classic row, column, and box constraints, then adds the extra rule for this variant.
Is this Sudoku variant good for beginners?
Start with recommended puzzles or puzzles with many solves; they are usually easier to approach.
How is difficulty judged?
Difficulty uses real player time, step count, and solve samples; when data is limited, the page shows that stats are still collecting.