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Rules of 'Windoku'

Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. Each of the four shaded 3x3 boxes must also contain the numbers 1 to 9.

EXAMPLE:


UNIQUE SOLUTION:

1 comment:

Rohan Rao said...

This is a very popular version of the extra regions sudoku.

Its great fun solving these!