🎯 Objective

Fill every row, column, and 3×3 box with the digits 1–9. No repeats allowed anywhere!

✖️ Diagonal Sudoku

Both main diagonals (top-left→bottom-right and top-right→bottom-left) must also each contain 1–9 exactly once.

🧩 Jigsaw Sudoku

The standard 3×3 boxes are replaced by 9 irregular coloured regions. Each coloured region must contain 1–9.

✏️ Notes Mode

• Toggle Notes (header or ✏️ button) to pencil possible numbers into a cell
• Filling a cell normally automatically clears its notes
• Use ⌫ in Notes mode to clear all notes in the selected cell

✓ Check

Highlights any incorrect entries in red. Correct entries are untouched.

🏆 Scoring & Streaks

• Best time per difficulty saved on your device
• Daily puzzle streaks tracked day-to-day
• Challenge friends with your result after solving!