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The sum clue restricts every cell on the diagonal, creating deductions that can affect several parts of the puzzle at once.
Avoid focusing only on the grid while ignoring the diagonal totals. The outside clues are often the key to progress.
Yes. Row, column and box logic still applies, but you also need to manage the diagonal sums provided by the outside clues.
Start with shorter diagonals and clues that have fewer possible combinations. They often provide the strongest early deductions.
The clues describe diagonals that run through the puzzle, so they are placed outside the grid rather than inside individual cells.