Diagonal Sudoku

Diagonal Sudoku

Fill every empty square with a number from 1 to 9. Each row, column and 3 × 3 box must contain every number exactly once. Both shaded main diagonals must also contain 1–9 exactly once.

1. Use the numbers 1–9, with no repeats in any row or column.
2. Each outlined 3 × 3 box also needs every number exactly once. Printed starting numbers cannot be changed.
3. Both shaded corner-to-corner diagonals must contain 1–9 without repeats. The center square belongs to both diagonals.
4. Every puzzle has exactly one solution. Repeated numbers are marked with an ×. Hint reveals a correct number; Undo restores the previous move, including notes.

Each variant saves separately on this device, including up to 100 undo steps. Offline play is ready when the menu says “Available offline”.

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Beautifully solved.