🔷 Antidiagonal Sudoku

📖 How to play Antidiagonal Sudoku

1. The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
2. Antidiagonal constraint: each of the two main diagonals (the shaded squares) must contain only 3 different digits. Since it has 9 squares, each digit appears exactly 3 times.
3. Tap an empty square and choose the number. Each puzzle has a unique solution.

💡 Tip: the three squares in each box that touch a diagonal must carry the same 3 digits as the rest of the diagonal. It's a very powerful constraint for ruling out options.

✏️ Notes mode: press the ✏️ button on the keypad (or the N key) to jot down candidates in the empty cells.