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The popularity of sodoku
perhaps lies, partially in the simplicity of its rules.
The basic sodoku puzzle is a 9x9 grid (81 squares).
The 9x9 grid is divided into 9 subgrids, or "regions",
which are 3x3, that are obviously made up of 9 squares.
The sodoku puzzle starts with some of the
81 squares already containing a number. These numbers
are called "givens". The goal of the game
is simply to fill the puzzle so that every row, column
and region contains the digits 1 through 9. Therefor
each number from 1 to 9 only appears once in each of
the 3 "directions" (row, column, region).
It’s that simple.
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