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Classic + X-Sum
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No. The standard Sudoku rules still apply. X-Sums clues simply add another set of restrictions.
X-Sums Sudoku uses outside clues where the first digit determines how many cells are included in a sum. This creates arithmetic deductions that depend on both value and position.
The arithmetic clues add another layer of logic, but they also provide extra information that can help narrow possibilities.
Little Killer Sudoku, Sandwich Sudoku and Killer Sudoku are natural next steps if you enjoy arithmetic-based Sudoku variants.
Yes. Notes can help track possible clue lengths, candidate totals and leading-digit possibilities.