Extra-Region Sudoku
A standard Sudoku, except that the digits 1 to 9 also appear in any shapes of nine cells of the same colour featured within the grid. As with other Sudoku variants, this additional rule creates a slightly different solving experience.
Instructions
Place a digit from 1 to 9 in each empty cell so that each row, each column and each 3x3 block contains all the digits from 1 to 9. In addition, each coloured extra-region must also contain all the digits from 1 to 9.
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