__Rules of Extra Region Sudoku__
Classic Sudoku Rules apply. Additionally each group of nine colored cells must also contain the numbers 1 to 9.

### Extra Region Sudoku (Fun With Sudoku #174)

### Extra Region Sudoku (Daily Sudoku League #149)

### Extra Region Sudoku (Fun With Sudoku #74)

### Extra Region Sudoku (Daily Sudoku League #26)

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__Rules of 6x6 Extra Region Sudoku__
Mini Classic Sudoku Rules apply. Additionally each group of six colored cells must also contain the numbers 1 to 6.

__Rules of 6x6 Extra Region Sudoku__### Extra Region Sudoku (Mini Sudoku Series #83)

Below are the Extra Region Sudoku Variations. Rules of these variations are mentioned on the respective pages.

Checkout more Sudoku Variations by clicking on the below image

Sudoku Variations Main Page |

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