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Soduko is a logic based number
placement puzzle game. The word soduko is Japanese and
is an abbreviation of the phrase "the digits must
remain single".
The first soduko puzzle was published
in 1979, however the game has seen a massive increase
in popularity since early 2005 with puzzles appearing
in a number of British newspapers.
The game is very simple to play and requires
only logic to complete. The puzzle is made from a 9x9
grid made up of 3x3 sub-grids, which are called regions.
The puzzle starts with various digits already in the
grid. The remaining empty grid squares should then be
filled in so that every row, every column, and every
region contains the digits 1 through 9. Each number
in the solution therefore occurs only once in each column
and row and also within each 3x3 sub-grid.
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