🎯 Goal: Fill every row, column and 3×3 box with numbers 1–9
👆 Tap an empty cell to select it
🔢 Tap a number to place it
❌ No repeats in any row, column or box
📝 Notes — pencil in possible numbers
💡 Hint — reveals one correct number
⌫ Delete — removes your entry
⚠️ Too many errors = game over!