🎮 OBJECTIVE: Fill the 9×9 grid so every row, column, and 3×3 box contains all digits 1-9 with no repeats! ⌨️ CONTROLS: • Click: Click a cell to select it (blue highlight) • Press 1-9: Enter a number • Backspace: Clear a cell • Spacebar: Start the game 📖 HOW TO PLAY: 1. Press SPACE to start 2. Some cells are pre-filled (golden color) 3. Click on empty cells to fill them 4. Enter numbers 1-9 using keyboard 5. Each row must have 1-9 6. Each column must have 1-9 7. Each 3×3 box must have 1-9 8. No duplicates allowed in rows, columns, or boxes! 9. Complete the entire grid to win 🏆 SCORING: • Correct number placement: +10 points • Completing row/column/box: +50 bonus • Completing entire puzzle: +500 bonus 📚 DIFFICULTY: • **Easy**: 30 cells pre-filled, simpler patterns • **Medium**: 45 cells to fill • **Hard**: 55 cells to fill, complex logic required 💡 STRATEGY TIPS: • Look for cells with only 1 possible number • Eliminate possibilities systematically • Focus on rows/columns/boxes with few empty cells • In Easy mode, use process of elimination • Use pencil marks mentally to track possibilities