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Sudoku X

Sudoku X adds both long diagonals as extra regions, so every digit must appear once on each diagonal as well as in every row, column, and box.

Related Sudoku variants

These pages cover related formats and alternate names for this puzzle type.

Diagonal Sudoku Diagonal Sudoku uses the Sudoku X rule: both long diagonals must contain every digit once in addition to rows, columns, and boxes. Killer Sudoku Killer Sudoku combines classic regions with arithmetic cages. Use the cage totals to narrow candidates before placing digits. Mini Sudoku Mini Sudoku keeps the same logic in a compact grid, making it useful for fast practice or newer players. Sudoku Variants Browse Sudoku X, Killer Sudoku, Mini Sudoku, Samurai Sudoku, and related formats.