📖 How to play Diagonal Sudoku
- The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
- In addition, each of the two main diagonals (the shaded squares) must also contain 1 through 9 with no repeats.
- Tap an empty square and choose the number. Each puzzle has a unique solution.
💡 Tip: use the diagonals as extra clues; they're usually the best place to start ruling out numbers.
✏️ Notes mode: press the ✏️ button on the keypad (or the N key) to jot down candidates in the empty cells.
📖 Want to master it? Read the full guide: How to play Diagonal Sudoku (Sudoku X): rules and tricks.