➕ Killer Sudoku

📖 How to play Killer Sudoku

1. The sudoku rules apply: 1 to 9 without repeating in each row, column, and 3x3 box.
2. In addition, the board is divided into cages (groups with a dashed border). A cage's sum must equal the small number in its corner.
3. Within the same cage, no number can repeat.
4. There are no given digits: it's solved using only the cages. Each puzzle has a unique solution.

💡 Tip: start with cages that have a very low or very high sum (for example, two squares that add up to 3 can only be 1 and 2).

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