Sudoku is a complex logic puzzle with simple rules.
|Fill in the 9x9 grid so that the digits 1 - 9 appear only once in each row, column and group (sometimes called box.) To illustrate this we've blanked out most of the puzzle to the left.|
|Irregular-group puzzles follow the same rules.|
|The X variants add 2 more constraints: both diagonals must also contain the digits 1-9.|
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