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Rules of 'Extra Region Sudoku'

Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. Each group of nine coloured cells must also contain the numbers 1 to 9.




Rohan said...

Extra Region sudoku is an extended version of a classic sudoku with the addition of sets of nine cells.

This is one of the basic and a very popular variation of sudoku found in many sudoku championships.

Ours brun said...

Some puzzles of this kind are really hard, but this one can be solved without taking a look at the two extra regions. Too bad ! :-(

Rohan said...

The examples are usually much easier, just to give the basic understanding to new-comers and first-timers :-)