What strategy tips will help me solve Extra Region Sudoku puzzles?
Apply all the usual sudoku rules of course.
But the main thing to remember is to apply the rules to the extra regions, too, because in all but the easiest puzzles you will need to use that information to solve the puzzle.
For instance, if you have four extra 9x9 box regions in the puzzle, then you will need to make eliminations based on those regions too in order to solve the extra regions puzzle, just like with sudoku X you use the information in the two diagonal regions to deduce what must go where.
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What strategy tips will help me solve Extra Region Sudoku puzzles?
Apply all the usual sudoku rules of course. But the main...
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