If you like Sudoku but want an extra challenge then you will love Jigsaw Sudoku.
The goal of Jigsaw Sudoku (also know as irregular sudoku) is similar to normal Sudoku. You must place each of the numbers 1 to 9 into each of the rows and columns.
However in Jigsaw Sudoku the normal 3×3 Sudoku regions are instead replaced by jigsaw-like regions of different sizes (outlined with the bold lines) that must contain every number.
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