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Difficulty
Easy, Normal
Variant
Classic + Sandwich
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Yes. Notes can help track possible sandwich arrangements and totals, especially on longer rows and columns.
No. The standard Sudoku rules still apply. Sandwich clues simply add another set of restrictions.
Sandwich Sudoku adds outside clues that give the sum of the digits located between 1 and 9 in a row or column. These clues create extra deductions on top of the normal Sudoku rules.
The sandwich clues add another layer of logic, but they also provide extra information that can help narrow possibilities.
Little Killer Sudoku, X-Sums Sudoku and Killer Sudoku are natural next steps if you enjoy arithmetic-based Sudoku variants.