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The rules of Sudoku are simply
that you must fill in the empty squares in the Sudoku grid so that
every column, every row and every 3x3 sub-grid contain all the numbers
1 to 9 once.
A completed puzzle is correct when
the number from 1 to 9 appear once in each "direction"
(horizontal, vertical and 3x3 sub-grid). Sounds simple? Well yes
the easy puzzles can be solved pretty quickly once you've been playing
a while but more complicated puzzles can be extremely difficult.
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